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Originally Posted by
Michael Grantham
It's not so much that you're tipping forward. You're pushing hips back first rather than breaking at hips and knees at the same time. You're also keeping your torso a bit too upright on the way down and failing to get your knees in place in the first half of the descent. This causes you to shift forward at the bottom, and then the hips come up to get into a decent position for hip drive on the way up.
Break at knees and hips at the same time. Don't be afraid to lean over a bit on the way down, but most importantly, get your knees in place early and keep them still.