Dont run motion, its proly worst tactics against 3-2 zone. Since ur team is built for outside tactics id run base offense or push the ball. They both explore weak sides of oponent ant strikes there.
even if this would be the question, i wouldn't choose base offense since outside attack is his strength and should be still the main option. Cause in this case your offense get sabotaged twice, one time through the 3-2 which defends outside shots better and base offense which robs you the bonus you get on your outside shots.
You play base offense then to attack his weak spot more often, which is below the basket but if this is the better option play Look Inside or Low post to utilize it with an "bonus". If your inside scorers are to bad for it, try to win your game stick with the offense you can play which is Motion/run and gun and maybe Princeton.
So now to the real question, what to do against FCP - i would threat it like a man to man defense fast or slow offense really don't make a big difference in terms of to, and there are theorys who sound plausible who state that fast is better AND that slow pace is better. So look out to the offense, which makes you perform best.
If you have two player of the same quality, take the one with better handling/passing or if you don't know which start need a break to be competive in other games take out the one who is bad in those skills.