Are you jumping from 315 to 365? You should really only add about 10 lbs. per week. If you make small jumps you will be stronger in the long run. Don't be in a hurry to stall your gains.
You would definitely be able to lift more if you used a parallel, PL style squat. That being said, an ATG squat obviously won't get red lighted for depth. Do what you want to do, man. Have fun.