I personally think that 3-2 works just great against look inside and low post. Havn't seen any big difference in outcome from when i play 2-3. I guess it depends on how good your defense is though. But stopping the ball from coming to his big men also leads to less fouls as well. So i wouldn't say choosing 3-2 zone agains a inside tactic is a bad choice but i guess good defense is a given for doing this.