Thanks for all the constructive comments. The feedback is appreciated.
I am shooting for an Oly squat, although I've determined that I really can't do a close-stance, upright torso, ass-to-grass, proper oly squat. When I try, I fall backwards. The only way I can do it is by leaning forward a ton, which defeats the purpose. Limb length, body proportion? Don't know. So, I guess I'm doing some kind of combination, which may be called an "athletic back squat"? (I've seen that language used to describe a combo-type squat). I'm basically trying to get maximum ROM, and I seem to be able to do that w/ a slightly wider than shoulder-width stance and high bar placement. I do try and spread the floor. And I try to keep upright so I try and sit straight down rather than back. Some good advice I got was, "Try and sit on your nuts."
I consciously try to pull my toes up to help keep the pressure on my heels, and sometimes at the top I'm driving w/ my heels enough that the balls of my feet will actually lift up a bit. Got that tip from Guinness, I believe.
As for knees coming forward, I think it's acceptable to some degree (I limit it by pushing through my heels) and the nature of the beast w/out doing a pure PL style squat.
Not falling forward is a chronic problem as the weights get heavier. I'll work on the power breathing method (thanks kingkrs!) and I currently do GMs to try & strengthen my back/hams. I'll keep doing 'em, and working on staying upright in the hole best I can.
Any more thoughts? Comments so far have been very helpful. I honestly thought my squat sucked so it's nice to hear it's not that bad. Now, any tips for adding 100-150 pounds to it? LoL