to throw your right hand with a weight transfer, your upper body must move over your front leg. this is because this motion is what causes the concentration of your body weight onto your front leg.

as your hips are rotating, move your upper body over your front leg in a downward forward motion. don't over bend your front knee. your chest is going to come just over your front knee, with the heel of your front foot staying under your front shoulder. your head will naturally preform a slipping motion.
heres a right hand thrown with no weight transfer.

heres a right hand thrown with a weight transfer.

your upper body moves over your front leg in a downward forward motion.

as your head naturally preforms a slipping motion as your hips rotate and square.

