[2k8 PS3] Gameplay tips?

Just started getting into this game and I'm struggling on the court. I'll admit, I am not the greatest basketball mind out there. I understand each positions' role and the basics of playcalling, but my gameplay is really stiff and slow while I learn all of the controls. So a few questions for you diehards still playing.

How do I increase my shot percentage down low? I'm barely shooting 40% from the paint. Been trying to use a mix of post moves and drives but it hardly seems to matter, everything just bounces off the rim.

What iso moves should I lean on? I like the spin and the regular cross over, but I get caught up on opposing character models super often if I try to drive the lane. Do I just need to string more of them together?

Is motion a good play book? It seems to fit my roster pretty well and the few times that I successfully execute a play I usually wind up scoring a bucket. Just not super familiar with the other possibilities.

Any other general gamplay tips? My closest loss has been by 7 and everything else has been a double digit blow out.