From what I can see, it looks like you're sitting down and rocking a bit too much on the box. Remember, your box squat should mimic your free squat, since there won't be anything to sit on at the meet. As a raw lifter this is even more important. As for depth, better safe than sorry, so try to take it down another inch or two.
Also, cutting 28 more pounds for a meet will backfire on you in my opinion. I know you want to be competitive, but tht much weight loss will hurt your strength. When you have stabilized at a weight class, then start worrying about the competition.
Just my 2 cents; best of luck!! Let us know how you do!