There are many thousands of seasons simmed here and less than 150 real MLB seasons to draw examples from. The raw number of examples from SIM is going to greatly exceed the raw number of examples from MLB, but even without any data, I'd wager heavily that the actual frequency of such winning/losing swings is no greater in SIM than it is in real life, and likely even lower because SIM teams aren't affected by in-season injuries or much roster turnover like an MLB team can be. Seeing more winning/losing swings here makes sense because there are thousands of more seasons in which those swings could have occurred, but that doesn't mean they occur here more frequently. I understand the frustration of seeing a good first half ruined by a drop in the second half, especially in a tournament setting like this with $$$ on the line, but that seems to be influencing your perception too heavily.

Thru 147 games...
.

Group	Win	Loss	Win%	Playoff
--------------	----------	----------	----------	----------
F	936	828	0.531	2.0
I	932	832	0.528	5.0
G	907	857	0.514	0.5
B	906	858	0.514	5.0
D	899	865	0.510	1.0
H	890	874	0.505	2.0
J	888	876	0.503	3.0
L	885	879	0.502	3.0
K	868	896	0.492	1.0
E	854	910	0.484	1.0
C	821	943	0.465	0.5
A	798	966	0.452	0.0

Decade	Win	Loss	Win%	Playoff	Best	Owner
--------------	----------	----------	-------------	----------	----------	----------
1900	989	775	0.561	5.0	96	redwingscup
1910	981	783	0.556	2.5	91	schwarze
1940	957	807	0.543	3.5	94	ozomatli
1990	907	857	0.514	5.0	85	skunk206
1980	879	885	0.498	2.0	91	mildnhazy
1970	873	891	0.495	3.0	88	brianjw
1960	865	899	0.490	1.0	85	schwarze
1920	852	912	0.483	1.0	87	skunk206
1930	823	941	0.467	0.0	76	PennQuaker
2000	822	942	0.466	0.0	79	pedrocerrano
1950	819	945	0.464	0.0	75	njbigwig
2010	817	947	0.463	1.0	78	mildnhazy
--------------	----------	----------	----------	----------
N.L.	5421	5163	+258	24
A.L.	5163	5421

Grp	Name	1900	1910	1920	1930	1940	1950	1960	1970	1980	1990	2000	2010	Wins	Total
-----	------------------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------
A	mpitt76	76		75		75		60		73		77		436	798
A	calhoop		76		55		67		56		63		45	362
B	schwarze		91				68	85	74		74		66	458	906
B	ozomatli	83		75	68	94				73		55		448
C	ejstockman		76		70		71		67		69		69	422	821
C	d_rock97	76		55		77		74		55		62		399
D	Jtpsops		82		75		66		64		76		77	440	899
D	dougpalm	87		70		82		67		78		75		459
E	GuerillaZen1	71	78		75	77	68	72						441	854
E	zlionsfan			75					63	70	78	56	71	413
F	slainte							71	77	76	82	77	70	453	936
F	PennQuaker	94	87	77	76	88	61							483
G	njbigwig		77		75		75		80		73		64	444	907
G	pedrocerrano	85		69		79		76		75		79		463
H	duece_duece	74		80		74		74		68		72		442	890
H	brianjw		82		59		71		88		82		66	448
I	skunk206		75	87	71				83	85	85			486	932
I	redwingscup	96				72	72	65				71	70	446
J	bardin		81		64		68	64	70			64		411	888
J	mildnhazy	92		66		77				91	73		78	477
K	buddhagamer	75		56		77		79		68		66		421	868
K	justinlee_24		86		67		70		83		68		73	447
L	batandball	80			68		62	78	68				68	424	885
L	Relkcirts		90	67		85				67	84	68		461
-----	------------------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------
	Total Wins	989	981	852	823	957	819	865	873	879	907	822	817
	Rank	1	2	8	9	3	11	7	6	5	4	10	12

Name	Group	Wins	AvgWins	Playoff	Diff
------------------	--------	--------	-------------	----------	--------
skunk206	I	486	442.9	4	43.1
PennQuaker	F	483	451.8	2	31.2
mildnhazy	J	477	450.1	3	26.9
slainte	F	453	430.3	0	22.7
schwarze	B	458	438.5	3	19.5
pedrocerrano	G	463	447.0	0	16.0
brianjw	H	448	435.0	2	13.0
justinlee_24	K	447	435.0	1	12.0
dougpalm	D	459	447.0	1	12.0
Relkcirts	L	461	449.8	3	11.2
njbigwig	G	444	435.0	0.5	9.0
redwingscup	I	446	439.1	1	6.9
Jtpsops	D	440	435.0	0	5.0
ozomatli	B	448	443.5	2	4.5
duece_duece	H	442	447.0	0	-5.0
batandball	L	424	432.2	0	-8.2
mpitt76	A	436	447.0	0	-11.0
GuerillaZen1	E	441	452.8	0	-11.8
ejstockman	C	422	435.0	0	-13.0
zlionsfan	E	413	429.2	1	-16.2
bardin	J	411	431.9	0	-20.9
buddhagamer	K	421	447.0	0	-26.0
d_rock97	C	399	447.0	0.5	-48.0
calhoop	A	362	435.0	0	-73.0
.
Total/Average		441	441	24	0.0

Both of my playoff teams have absolutely tanked over the last 20 games, while my last place teams are on fire, with winning streaks of 10 and 7 games. There is zero rhyme or reason to this game. It's quite laughable actually.

Thru 152 games...
.

Group	Win	Loss	Win%	Playoff
--------------	----------	----------	----------	----------
I	970	854	0.532	5.0
F	967	857	0.530	2.0
B	942	882	0.516	5.0
G	935	889	0.513	0.0
D	929	895	0.509	1.0
J	921	903	0.505	3.0
H	916	908	0.502	2.0
L	913	911	0.501	3.0
K	896	928	0.491	1.0
E	888	936	0.487	1.0
C	847	977	0.464	1.0
A	820	1004	0.450	0.0

Decade	Win	Loss	Win%	Playoff	Best	Owner
--------------	----------	----------	-------------	----------	----------	----------
1900	1026	798	0.563	5.0	99	PennQuaker
1910	1003	821	0.550	2.0	94	schwarze
1940	995	829	0.546	4.0	97	ozomatli
1990	939	885	0.515	5.0	88	multiple
1980	909	915	0.498	2.0	94	mildnhazy
1970	899	925	0.493	3.0	93	brianjw
1960	898	926	0.492	1.0	90	schwarze
1920	887	937	0.486	1.0	91	skunk206
2000	853	971	0.468	0.0	83	pedrocerrano
1930	847	977	0.464	0.0	79	multiple
2010	845	979	0.463	1.0	81	mildnhazy
1950	843	981	0.462	0.0	77	redwingscup
--------------	----------	----------	----------	----------
N.L.	5601	5343	+258	24
A.L.	5343	5601

Grp	Name	1900	1910	1920	1930	1940	1950	1960	1970	1980	1990	2000	2010	Wins	Total
-----	------------------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------
A	mpitt76	79		79		77		65		75		79		454	820
A	calhoop		77		55		68		56		65		45	366
B	schwarze		94				70	90	75		78		69	476	942
B	ozomatli	87		77	71	97				75		59		466
C	ejstockman		79		71		73		69		72		72	436	847
C	d_rock97	79		55		80		76		58		63		411
D	Jtpsops		83		76		68		67		80		80	454	929
D	dougpalm	89		73		85		70		81		77		475
E	GuerillaZen1	74	81		77	80	70	75						457	888
E	zlionsfan			78					66	74	81	58	74	431
F	slainte							73	79	77	82	79	72	462	967
F	PennQuaker	99	89	82	79	93	63							505
G	njbigwig		79		79		76		82		74		67	457	935
G	pedrocerrano	87		71		82		78		77		83		478
H	duece_duece	77		83		78		76		69		75		458	916
H	brianjw		82		59		72		93		86		66	458
I	skunk206		78	91	73				86	90	88			506	970
I	redwingscup	98				76	77	67				73	73	464
J	bardin		82		66		71	68	71			68		426	921
J	mildnhazy	96		69		79				94	76		81	495
K	buddhagamer	79		59		79		80		70		68		435	896
K	justinlee_24		87		71		72		86		69		76	461
L	batandball	82			70		63	80	69				70	434	913
L	Relkcirts		92	70		89				69	88	71		479
-----	------------------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------	-------
	Total Wins	1026	1003	887	847	995	843	898	899	909	939	853	845
	Rank	1	2	8	10	3	12	7	6	5	4	9	11
	Average	85.5	83.6	73.9	70.6	82.9	70.3	74.8	74.9	75.8	78.3	71.1	70.4	456

Name	Group	Wins	AvgWins	Playoff	Diff
------------------	--------	--------	-------------	----------	--------
skunk206	I	506	457.0	4	49.0
PennQuaker	F	505	466.8	2	38.2
mildnhazy	J	495	466.8	3	28.2
schwarze	B	476	452.3	3	23.7
slainte	F	462	445.3	0	16.7
pedrocerrano	G	478	464.0	0	14.0
Relkcirts	L	479	465.5	3	13.5
justinlee_24	K	461	448.0	1	13.0
dougpalm	D	475	464.0	1	11.0
brianjw	H	458	448.0	2	10.0
njbigwig	G	457	448.0	0	9.0
redwingscup	I	464	455.0	1	9.0
ozomatli	B	466	459.8	2	6.2
Jtpsops	D	454	448.0	0	6.0
duece_duece	H	458	464.0	0	-6.0
mpitt76	A	454	464.0	0	-10.0
GuerillaZen1	E	457	467.7	0	-10.7
ejstockman	C	436	448.0	0	-12.0
batandball	L	434	446.5	0	-12.5
zlionsfan	E	431	444.3	1	-13.3
bardin	J	426	445.3	0	-19.3
buddhagamer	K	435	464.0	0	-29.0
d_rock97	C	411	464.0	1	-53.0
calhoop	A	366	448.0	0	-82.0
.
Total/Average		456	456	24	0.0

Got a much-needed schwarze in the PM cycle, too little too late for the two other teams I have with division title possibilities, I'm afraid. I miss the days when my 1920s team was outperforming expectations ...

How will ties be broken if two people finish with the best record for a decade?

From page 1...

Round 2B
The team from each decade with the best W-L record will advance to compete in another 12-team league. If tied, bonus points are used. If still tied, then best expected winning percentage is used. The World Series winner of this league will win $100. The World Series loser gets $35

Thru 156 games...
.

Group	Win	Loss	Win%	Playoff
--------------	----------	----------	----------	----------
I	993	879	0.530	5.0
F	991	881	0.529	2.0
B	964	908	0.515	5.0
D	959	913	0.512	1.0
G	953	919	0.509	0.0
J	953	919	0.509	3.0
L	943	929	0.504	3.0
H	937	935	0.501	2.0
K	922	950	0.493	1.0
E	911	961	0.487	1.0
C	869	1003	0.464	1.0
A	837	1035	0.447	0.0

Decade	Win	Loss	Win%	Playoff	Best	Owner
--------------	----------	----------	-------------	----------	----------	----------
1900	1050	822	0.561	5.0	101	PennQuaker
1940	1031	841	0.551	4.0	100	ozomatli
1910	1026	846	0.548	2.0	96	Relkcirts
1990	965	907	0.515	5.0	91	skunk206
1980	929	943	0.496	2.0	96	mildnhazy
1970	926	946	0.495	3.0	95	brianjw
1960	922	950	0.493	1.0	90	schwarze
1920	903	969	0.482	1.0	91	skunk206
2000	873	999	0.466	0.0	85	pedrocerrano
2010	872	1000	0.466	1.0	84	multiple
1930	869	1003	0.464	0.0	81	PennQuaker
1950	866	1006	0.463	0.0	79	redwingscup
--------------	----------	----------	----------	----------
N.L.	5745	5487	+258	24
A.L.	5487	5745