i am certainly no expert, but that said i think your form is pretty damn good, even with the heavy weight. Nice depth. How do you feel the next day? Sore in the legs and no lower back pain? If thats the case keep it up. If Your lower back is tight or sore, then your form is in fact off. You may want to google "Mark Rippetoe" he is a fairly respected trainer and your squat style seems to fit his style. He has a number of videos that you may find helpful.
My non-expect opinion, if you want to eliminate the forward lean, then incorporate front squats into your training. You simply can't lean forward in a deep front squat because the bar will roll off your shoulders. Period. Try 225 lbs, ATG front squat and see. Also, doin front squats will strengthen your middle back as well as help you develop a straighter torso in the squat. See Rippetoe's back squat vs his front squat video. Very different. Each has benefits.