Depth was fine, and would pass in a meet.
The two pointers I would give are 1) Take a huge belly breath full of air before you Squat and 2) Pull your elbows under the bar and lock in that position. This will keep your chest up and keep you from falling forward on the heavy weights.
Don't beat yourself up over those Squats. They weren't that bad, and with a couple of tweaks you could be close to 4 plates.