just try to regularly incorporate explosive routines in your work-out.
you need to develop your calves kasi eh. if you need more information on this, PM me. i'll try to give you detailed examples.
i remember when i was around 17-20 years old, i can dunk with both hands, both hands kasi maliit kamay ko. di ko ma-grip ng maigi yung basketball.
pero ngayon, i can't even reach the net... hehehehehe. puro posisyonan and low post na lang....