From what I see with a quick look:
bowler 2: Has no knee, or waste bend at all.
bowler 3: similar to your issues, violent delivery, with that back foot kicking up way too high.
Bowler 3: also same issue with the back foot, and he never bends his elbow on the backswing.
Bowler 4: needs more knee bend, and his hand is on top of the ball the whole time.
Just what I see, others may see more than that.
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