Keeps Dunking!!

I created myself, who can't dunk thus my Dunking ability is 1, jumping is 60. Yet, everytime in game I do a layup/dunk key, I continue to do 360 dunks and all other fancy slams....What's up with THAT!?

I then chose Iverson to practice, he never dunks yet his Dunking ability is at 40. I chose Nash and all he does is lay up, yet his jumping is at 75 and his Dunking is at 1 like I am.

How can I make my created player NOT dunking!??

Edit dunkpack.

That's the only way to do this? This is unreal...then what's the point of having your guy's Dunking Ability at "1"? Then?? He still does Vince Carter dunks with easy!