The Descent
1) If you’re not hitting depth: the weight is too heavy; or your hips are too weak; or you’re not spreading the floor enough on the way down-or a combination thereof
2) Over-speed eccentrics is only effective in practice to a point. Drop too fast, and it will take immense force to stop the bar and reverse it, so much in fact you’ll be weaker out of the hole. Therefore, a not too fast, but not slow descent is optimal. Find the happy medium
3) Much of your squat success happens prior to the actual lift. A proper setup, aligned correctly, tight, upper back locked in, quiet walk, correct brace, will keep you in the right position in the descent and lead to a powerful, strong squat that can correctly handle big weights.
-Fenske