what i do when i do that trick is do the roll in move like you do, and then do just a sun behind my back. after that i go into the sun between the legs move. it just takes practice and getting used to the feeling.
i'm working on a move....which might actually be original. i will see if i can get it down good and then submit as trick of the week, or just post it randomly.
uhm yeah, so basicly, just keep practicing it, it's just like most tricks, you need to learn how they feel.