im also left handed and this used to happen to me... just shift your hand till its central after your shot.. eventually muscle memory will kick in and your hand will be going straight...

it doesnt really matter too much as long as the index and middle finger are above and inline with the rim... hope this helps

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Height:6'2
Standing Vertical Jump: 32.5"
Running Vetical Jump: 36.8"

Leave Layups To The Mortals