Honestly man, the over-extension is a problem..but I guarantee you that the back pain is coming from letting your back round at the bottom of the squat, or "butt-winking." I had the same problem and my lower back was always sore. What you need to do is stop going so deep. Stop right when you get just below parallel and bounce back up. It's impossible to go "ass to grass" while keeping a rigid spine in a low bar squat.

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