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These are not really low bar squats. The bar is riding kind of high on your back, your upper back isn't being held tight enough. Your stance is narrow and needs to be widened by at least the width of your feet on both sides. When you squat, break at the knees and hips simultaneously and immediately aim your chest at the ground. Your knees should not go much past your toes and they need to get there by the time you are halfway down. Keep your knees there until you are halfway back up.