One reps 1, 2, and 5 you lifted your chest instead of staying in the hips. But that's not the problem with your elbows and wrists. I think you should take a little softer grip in the bar. Grip tightness is not what secures the bar in a squat, it's the position of the forearms and the hands behind the bar, trapping it in place. Stop squeezing so hard and see if that helps.