What other problems did you see, Poly?
For what it's worth:
From the successful attempt:
In your starting position you seem to have the bar and your hands in the right places, except that your upper back is a bit rounded (on both attempts, actually). You jerk the bar when you lift first lift it; when I slowed the video I saw your upper back bending first and then you jerking the bar by slightly bending your arms and then pulling up. It seems that you're bending your arms on the way up as well. The rest looked pretty good and I wish that I could keep the bar this close to the body.
On the failed attempt:
You seemed to move your ass up quite far before the bar actually left the ground. At one point it looked kind of like a good morning with your torso nearly horizontal and the bar barely off the floor. In any case, you caught the bar pretty high, but it's probably lower than what you're used to so maybe you tried to squat down with it and that's what got you?
In both videos you were doing some version of the second pull correctly. That is, I think I see the 'scoop' when I follow your knees. So that's good news.
My recommendation would be to try and slow down the first part of the pull, then accelerate from about your knees without worrying about the second pull, since you appear to execute that naturally. Hopefully slowing down the first part will keep the bar where it should be, keep your energy for the jump, and keep your arms straight so that you're not losing momentum to straightening your arms and such.
Also the hook grip. Give it a try for like 2 weeks and see if it makes a difference?
You're definitely capable of 300+, by the way.
Besides, jas lost his mojo a long time ago....
