Back roll more like a flip

I have been trying back rolls occasionally lately. I am getting a full rotation, but it is more of a flip (end over end) than a normal back roll which sort of starts like a flip, but is a roll from middle to landing. If you can't visualise what I am doing, I am keeping my chest and ts edge toward the boat through the whole trick instead of pointing the tip at the boat mid flip. I have tantrums pretty much dialed in now, so I want to start really working on the back roll, but don't want this bad form to get too badly ingrained!!! I will try to post video up tonight. Thanks for any help!