How to make a facial dunk?

Is there any way to make an in your face dunk by aggressive dunkers like Griffin, Shaq? I just can`t figure out how to as long as there is a denfender somewhere in front of my dunker, he only tries to make a lay up..even the opponent is way smaller than the dunker.. too frustrating
Anyone could give advice?

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You could tweak the sliders to favor you if you're that desperate. Traffic Dunk Frequency to 100

ok, great answer