If theres something I noticed in this game its that experience has a decent effect on Shooting , just like in real life. I have a 19 yr old shooting 39% FG and 31% 3 FG with Atrocious experience , well he got a pop to Pitiful yesterday , and a 21 yr old shooting 46% 3 FG and 49% FG with Awful Experience. So basicaly what affects shooting is : Experience , Stamina , JS , JR ,Opponent , Tactics , Opponent Tactics, Position , GS and more.Thats pretty much it.