The angle of the torso, when squatting, is not a function of whether or not the bar is high or low on the back. The angle of the torso (and thus torque on the spine) is primarily determined by the angle of the shin, a.k.a how much the ankle dorsiflexes. AND IN MY BOOK, THIS IS THE KEY TO BEST BACK TRAINING PRACTICES. GET IT??? MAKE YOUR QUADS, HAMS AND GLUTES DO THE WORK. If your shin is perpendicular to the floor, then your torso will incline forward to keep the CoM over your BoS, regardless of how low the bar is on your back. And your back will be forced to handle higher torque. A good, general rule of thumb, IMHO, is to keep the shins and the torso parallel, from an inclination standpoint. This could change with femur/torso length issues (tight adductors and hips in general can cause issues too), but this method is pretty good to help someone figure out whether or not they have decent ankle flexibility when squatting. And this will minimize torque on the back, as we will d...
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http://ironmaven.blogspot.com/2008/08/casey-burgener-class-act.html
This was a PR lift (224 kg CJ) to make the Olympic team, or so Casey--the most consistent international performer over the last quad--and the rest of us in Atlanta thought.