ive had trouble with my team racking up fouls.  so what are the main factors that affect fouling and how do I limit them?

heres the ones I know,  but what magnitude can be associated with these and what can I do to fix my problems

1. my players attributes like DEF, SPD, ATH, and IQ play mojor roles 
2. the other teams players offensive attributes plus their distrobution 
3. their offence (motion, FB, triangle, etc...)
4. my Def positioning (-2, 0, +2, etc.....)

what can I do besides recruiitng players with more ATH, SPD, DEF and building up their IQ to help lower my ahcking issue?

1) Slow tempo
2) Indirectly -  improve your rebounding and BH/P.  Turnovers and offensive rebounds by your opponents increase their # of posessions and lead to more fouls by your team.

In your case your big men are sorely lacking in athleticism and are racking up a lot of your team fouls.