one of the big advantages to zone is the ability to switch back and forth from 2-3 to 3-2 depending on situation. Your IQ in zone allows you to play either at the same IQ effectiveness. Personnel may dictate that one set be better than the other as you touch on...

I don't see what LP has to do with it at all.  2-3 vs. 3-2 is a defensive change only, and LP is a purely offensive rating.  The primary determinant of which defense to use should be your opponent's offensive tendencies, and if it's close you then look to your ideal defense.  If your SF is fast but has poor REB and SB, you might lean towards the 3-2.  If your SF has good REB, 2-3 is going to give you an extra rebounding edge; if he also has high BLK, then you really might lean towards 2-3, but you still base the decision heavily on your opponents' tendencies from game to game.

For the zone aperi and from a defensive standpoint on what's required you need the best RB bigs 90's preferably. As you list SB is also more important in zone than the other sets so don't ignore this setting. Great Def is also a must and don't let anyone tell you different. Some coaches go overboard with the hiding a bad defender theory, get the best rated defensive players you can get.(You don't want to be hiding too many bad defenders because the D will be ineffective) I try to recruit defense for a zone like I would a MTM. 

2-3: (Now this is a theory I learned from another coach who specializes in zone play. Other coaches may feel differently) You want bigs from the 3 - 5 spots... no hybrid SF types with your best BH/PA big playing the 3 and worse as you get up to the C postion. This def primarily focuses on stopping scoring in the paint and good coaches will always try to shoot over your 2-3. For that reason I try to stay on the + side in my settings. 

3-2: This of course is a PER defense. For my taste I like having more speed with this D. At the d2 level I try to have an average of 60 SPD here. It's my thought and other zone coaches thoughts that have spoken to about this that speed in a 3-2 helps lower FG%. You want your bigs in the post to have as much RB and ATH as you can get with the best D and SB you can get to accompany it. Inversely with this D I try to stay - with my settings as it is already a PER defense and you have to worry more about the scoring in the post (or you can just switch to 2-3 if that's the style you want)

As stated above you can switch between sets and some coaches encourage switching between 3-2 and 2-3. I've tried all three ways (just running 3-2, just running 2-3 and switching between both. 

Weaknesses: expect to give up lots of offensive RB's running this D as there is no boxing out. It's the least popular D out of all 3 and probably most coaches feel it's the weakest set as well. I know in Knight D2 there are only 3 teams in the top 25 running this D, but don't let that discourage you as the zone can be very effective. 

Strengths: The biggest strength is really the stamina boost. If you can recruit some 90 stamina players with this D they can play 35 min a game no problem so the zone is great for teams with short benches. 

Hope this helps.

Thanks guys