Yeah, generally higher psi = more paint atomization, which helps avoid orange-peel. Of course too much atomization can also cause the paint to dry before it reaches the piece, creating a sandy effect. It's a pretty careful balance. Also, sometimes high humidity can cause similar problems, even when you're doing everything else right. Airbrush troubleshooting can be a real bitch.
And yeah you'll probably need to wet sand it, wool is more for just scuffing things up, but def be cautious with it.
