Im 15 and 6'1. I went to the park trying to dunk. The rim was 9'10.5 me and my friend measured it. I am in the middle of VJB Novice Weights and Novice Plyos so I am really sore and tired. I can usually palm the ball and make it look more like a dunk but it was freezing and my hand were cold. Please tell me how many more inches I need to dunk it. Constructive criticism please.

http://www.youtube.com/watch?v=-q1yLZoYsFh4t