More info. would help. How tall are you? Are you currently trying to do a real PL style squat? Or are you just having balancing problems if you don't go "pretty wide" as you describe it? And how wide is "pretty wide"?
I ask b/c I had serious trouble getting my squat form down, and finally found a groove . . . my "ass to grass" squat is a bit wider than some (most?) and I can't really sit on my ankles due to the wider stance, but I can get well below parallel. Don't know if its right, but after trying lots of diff't things, that's what worked. I just think some people are dimensionally better able to do a narrow stance, upright torso, ass to ankles squat. Others can't. Or maybe I am just t3h suck.
Oh yeah, dropping shoes helped a lot too.