When you’re doing high pulls, your shoulders should be over your knees, not in line with or behind. Remember it’s not deadlifting.
I don’t know if those are push presses or jerks, if they are jerks you need to be more violent and use your legs to lock the weight out, it can’t be a press type movement.
I agree that your shoulders need to be a bit more forward-directly over the bar(some books describe it as if the shoulders are ahead of the bar-which isn’t really the case-imo-but may be the sensation/perception) from the start and not behind. It might be useful to emphasize more hip action backwards rather the degree of knee bend you are getting into to establish a starting position.
I think you’ve got your elbows too high in your jerk/push-press(?) position. While you certainly would not want them pointing down towards the floor, I don’t think you want them up so high as if you were doing front squats-elbows in a more neutral position. I also agree that you need more leg “kick”. More vigorous use of the legs to start the movement.