Lumberg and honest critique shows a few things from your vids- on the first vid yopu knee wobble on the way up from the bottom. Basically this tell that you hip are weak and need a little more work to catch up to your quads and erectors. Also on the vid3 your ass comes up way too early on the last few reps- hit the hamstring hard and you will be able to push up more instead of goodmorning the weight up, not bad at all though since you at least squat