i can see in your video that you got a great shot the loft at the foul line is not bad (there's a guy in my jr bowling league who dose the same thing and he shot 4 299's this past year and he dose the same loft.)
but when you got the camera up behind you i can see you don't have a lose arm swing you arm using the muscle in your arm to throw the ball that's why your arm is bend on the backswing witch it stays bent right up until the throw witch is known as a chicken wing.
to help you get rid of the chicken wing when you go up and practice sometime try keeping your arm loose it will take some time.
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