Honestly, I think your kickflip is just fine, but for my two cents:
Start flicking later into your ollie. The way I was able to start to do them higher and more comfortably was by putting my foot closer and closer towards the ollie position, which helps you max out your ollie before the flick actually happens and makes the kickflip act more like an ollie.
I'm not sure if that made any sense at all, but I guess what I'm saying is look at Reynolds or Westgate or Lizard King or any other dude with a real healthy-looking kickflip, and look at how long their foot stays on the board before it starts to flick and I think you'll see what I'm talking about.
Also, with an ankle injury just take it slow. It all comes back, frustrating though it can be.
EDIT: Upon watching again, I also like that you go fast while doing kickflips.