There is a gentleman in the gym who was explaining how to do a Clean High Pull based off your video.
I have watched your video over and over and I notice these two things:
1) Heels leave floor as you're exploding up
2) Shoulders appear to be moving upward, not back
The gentleman was explaining that your feet remain flat and that you're pulling backward as you go up.
Am I interpreting your video correctly?
A hui ho.