hips are coming up too high--you get super low with that active start, but then they shoot up almost as high as your shoulders before the bumpers even come off the floor. You can get away with that for a while, but as the weight gets heavier, it will really start pulling you forward. it also tends to encourage unstableness overhead. try getting into a static start position with the hips a little higher than the knees and keeping that back angle the same until the legs are fully extended.
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