There are a couple of things you can do for this. One, which a few may disagree with, is partials that focus on the part of the movement you're having dificulty with. Just do the partials until the issue is corrected. Another is deadlifts (if you're not already doing them), hyperextensions, and other lowe back work to strengthen the lower back which seems to be giving you some trouble. Also, don't use the belt when you squat, ths will also help strenghten your lower back.
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