i've said this before (citing Rip of course): walk up to the bar and reach down and grab the bar before bending your knees. whether that is crucial/nitty or not, the point is that you're not even doing the very first (and incredibly easy) step correctly, which shows a a certain non-chalantness and lack of focus, which might be contributing to the rest of the DL not looking so great.
when i see vids of others DL (pro or not), they seem to take their time and are stable (nothing is moving around) in the setup, whereas in yours everything seems to be moving around (including the bar) and unstable.
this is what i was talking about
: you're bending knees before you grab the bar
http://img30.imageshack.us/img30/9740/74797898.jpg