Rip,
I'm a novice lifter following the linear progression you've outlined in SS and PPST. I appreciate your writings. I've searched this board and read the available articles, but I couldn’t find a way forward with this squat asymmetry issue.

On squats I progressed to 102.5kg (226lbs) x5x3 and decided to video them since I've been having difficulty keeping my knees out. The video shows that my left knee buckles in and I try to correct it, but not before the symmetry of the squat is thrown off (right hip rises first, resulting in a lateral shift in that direction).

Video of 102.5kg (226lbs) x 5, 2nd set: http://vimeo.com/14068772

Video of 105kg (230lbs) x 4: http://vimeo.com/14069671

Leaving aside those with anatomical imbalances (one short leg, etc.), the standard advice for folks who have asymmetrical squats is to get the knees out and keep them there until the muscles strengthen and symmetry is achieved. Today I lowered the weight to 85 kg (187lbs) for 5x3 and focused on keeping them there. The video reveals a strange imbalance- though the squat seems symmetrical in the sense that the hips rise evenly, my right knee is much farther out than my left. The entire squat seems to be shifted slightly to the left.

Video of 85kg (187lbs) x 5, 1st set: http://vimeo.com/14125180

I'm not experiencing any pain and wasn't aware of this issue until I filmed it. I'm uncertain what is causing this or how to correct it. My other lifts are still improving without issue. Height is steady at 6', bodyweight is 178lbs and rising.

Is this squat asymmetry a result of flexibility differences between right and left legs/hips? What would you advise to remedy this issue?