Main thing is knees caving. I feel like a broken record on that one, but people keep doing it. Personally I'd coach a slower decent as well. You're not going to drop that fast with a heavy weight, so don't do it with a lighter weight either. Treat every weight like it's heavy, and you'll be ready when it really is.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)