I know you posted a while ago, but if you're still having trouble I have a suggestion. I used to do the same thing, and I figured out that it's really not hard to get the rotation for the flip.
Your rotation looks fine, but you're not getting any pop. In the video it looked like you were throwing the trick before you got a chance to pop. How I fixed it was to tell myself to just pop first, then RIGHT BEFORE I leave the wake, I throw the flip. Try the same thing, but wait a little longer and pop.
It wouldn't hurt to take a more aggressive cut, but my personal opinion is that if you get pop first, then throw it, you'll start sticking the trick everytime.