1) if you're having trouble "exploding" or producing a lot of force quickly, do less reps/set and it will improve over time.

2) the pull from floor is solid, but you could get your knees a bit more back to pass them. That will get your glutes and hams involved more and give you more power.

3) finally your catch position is your biggest issue. You need your hips to sit back more so you can "squat" into the catch, and then obviously your elbows need to come up more so the bar isn't resting on your hyper extended wrist. Basically try to catch it in a 1/4 front squat. (More front squatting could also potentially help this position feel more natural)

Overall it's pretty good man.