overall, i think you did a pretty good job with those. the exercise of trying to come up with these formulas is incredibly useful, and im glad to see you are breaking it down beyond just a position, to a role - that is the right way to do it, for those seeking to move to more advanced levels of play. i cant tell you how many hours i spent doing this, but i did it implicitly all the time while evaluating players (id think about the formula, but thinking about the formula was not the main objective), and its easily hundreds of hours, just in my first two years.
anyway, some comments:
REB - i generally consider rebounding and ath to be at least 2:1 and maybe as much as 3:1 in rebounding ability, so id go closer to 30/70%, or at least 33/66%. long ago i placed it more like 2.5:1, now i probably am more in the 2:1 camp.
PER DEFENSE - i think this is close, although i would guess that if ath is more important than spd in m2m, its slightly so, not 1.5x. but i do probably agree that ath>spd for defense, for guards in m2m, although again maybe more like 1-1.25x than 1.5x. i do peg def as roughly twice as important as ath/spd in m2m so we are about on the same page there.
POST DEFENSE - speed may be a small component. the def:ath ratio is probably a little more than 1.6x, maybe closer to 2x, but using round numbers, i think thats good.
3 POINT SHOOTING - this is one of the toughest ones to discuss, because its very situational. the previous ratings do vary slightly by opponent (their set and players), as well as the position and situation your players are in on your own team. but by and large, those fluctuations are small. for 3 point shooting, its not. for example, a player who sort of fits your formula - high per, low bh/spd - they will be MUCH more successful against lower quality opponents, really, lower quality defenders. if you are playing terrible defense, your formula is not far off - although you still overvalue per in relation to spd and bh. just slightly, and spd > bh for high power 3 point scorers, while for lower powered ones, its closer to even. against top opponents, id probably do more like ath 10%, spd 30%, bh 25%, per 35%. not exactly right, but im rounding to 5%, its pretty close.
PER SCORERS (-2) - this is kind of a confusing definition, I thought you meant guards/sfs who have some per but not enough to shoot 3s, but your ratings make me wonder if you mean something else. also, thats kind of a huge range, a player with a lot of lp has more value on ath, a player with less lp still significantly values spd over ath. for this d2 player: 55 ath, 80 spd, 50 per, 40 lp, 65 bh - i would rate the marginal point of those ratings at approx: 15% ath, 20% spd, 20% lp, 25% per, 15% bh (thats only 95%, i really would have to go down to single %s to make that accurate). for this d2 player: 75 ath, 60 spd, 40 per, 50 lp, 65 bh - would rate the marginal point of those ratings at approx: 20% ath, 20% spd, 20% per, 25% lp, 15% bh. as you shift to a really poor per player with lp, ath definitely will pass spd, but at the 1-2, its unusual for that to be the case. the advantage of ath at the extreme is far less than the advantage of spd at the extreme, so for most players at the 1-2 playing -1 or -2, spd>ath will hold. its usually true at the 1-2 that per>lp but when ath is high enough and spd/bh get low enough, i think its possible for lp>per to be true, but generally per>lp holds. bh remains fairly important. at the 3, i consider a significant shift to take place, where ath>spd is true a slight majority of the cases, and where ath's advantage over speed in the extreme (high lp, low per/bh) is roughly equal to speed's advantage over ath in the extreme (high per/bh, low lp). bh also takes a significant but not massive drop when you go to the 3.
PGs - this one is the one i disagree with the most. for a triangle pg, spd and pass are the two most important ratings, and then bh. now, heres the tricky part, are you just talking the "PG ability on offense", which i often call "ability to run the offense", or just a PG as a whole? if you are just talking ability to run the offense, i would go with something like, 1.3x for pass to bh, and 1.1-1.2x for spd. hard to put that into 5%s but id roughly go with, 10% ATH, 30% SPD, 25% BH, 35% PASS