rammer, i've been looking at your vids over and over - for whatever reason, on both types of fails you're not getting around to your toeside edge.
i would agree with ricky that you're not edging progressively well enough and not standing up tall at the wake. it's all about how you approach and leave - notice how in one of your cuts you slide out at the beginning. get that progressive edge and pop and the rest of the trick will fall into place as you obviously know how to execute it.
let us know how it goes - nice add of the seinfeld audio too!
edit: just looked at this instructional: http://www.wakeboarder.com/tricks/halfcabroll.phtml
interestingly enough, your landing position looks like photo 4 in the progression.
(Message edited by deepstructure on October 03, 2005)