ok well 1 thing i see you still do is when your about to throw the ball ether 1 handed or 2 handed but 2 handed is worse is that you are like forcing the ball forward witch is making you bobble your head around and witch if you do this too much you could actually really hurt you neck.
2- i see when you get to the line before the ball has even came off your hand your body is low at the start then you just stand up really fast right as it is coming off your hand keep your body at 1 level threw the approach and throw and try to stay in the same position untill the ball hit the pins then move from that spot, because with standing up to early before the ball comes off your hand can created missed shots, bad throws. but it can also hurt your back at the same time.
these are the 2 main things i see you doing wrong and once you fix these the rest will fix naturally.
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