Definitely looking strong.
Just some quick observations:
You're hyperextending quite a bit on the heavier attempts, but more significantly, it looks like you're over-pulling the bar (up and into you) with the arms. On a related note, you're absorbing the force of the bar in an awkward position. Your receiving position, regardless of the weight, should be more of a "sit," with the hips slightly back and shoulders slightly forward -- think of the posture for a front squat. Looks like your timing's a bit off and you're overpulling, so I would really try to sit faster...make it fast and crisp: extend then <BOOM!> sit.
One last thing is try dropping the hips a tiny bit at the start and keep a tight lower back arch & big chest.