backroll question

I have tried a backroll probably 50 times and everytime I under rotate and end up digging the nose of the board in the water (yes some of these hurt like hell).

I paid 300.00 bucks for an instructor to help me out and he couldnt tell me what I was doing wrong, he sucked.

My question is this, do I really HUCK this flip? I usually just pop and kinda snap my head and shoulders to my back foot. Should I be HUCKing it like a flip on the tramp? I can front and back flip on the tramp with no problem but do I need to THROW this flip like a flip on the tramp?


Thanks.