Getting rocked on a roll

So the last two days I have been trying to get a backroll down for my first invert. I've had a few where I've been really close, I've got the rotation but just slipped out, but out of maybe 25 tries i've probably had only 5 of those. I don't know what I'm doing wrong. I'm either just short on the rotation or it's like I'm getting pulled off axis, like i shold be doing a circle across the wake but it's more like an ellipse, if that makes sense. I've got 3 different attempts here, skip towards the end because most of the stuff before is just a little carving around and a few wake jumps in i believe #2, but if you want to look at the whole things feel free to critique me on anything you see, I'd be happy to hear it. Please see if you guys can tell me what i'm doing wrong, I'm dying to finally stick one. It might be a few days tho because I've never been so bruised I don't think haha.