Your back swing is within an acceptable range. take a close look at the video and look at two things.....your slide foot is pointing too far left and that makes you pull the ball in front of your body and your balance leg (right leg) is still in the air and your toe should be on the floor.
Try getting those squared away and that will help somewhat. Also, when you shot the 272, it was in practice and you were probably very relaxed. This is the mind set you want to bring into league competition. Relax by taking a deep breath before you get up on the approach. Hold the breath for a couple of seconds then release it. It'll help you relax.
Bob
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