[YodasLuke]

I'd have to agree with BRay. In watching the Youtube pre-shot, it looks as though you're trying to keep a Cocked Left Wrist through Impact. The Left Wrist should be in the process of Uncocking. Centrifugal force wants the club to reach an in-line condition, and the attempt to keep the wrist Cocked is in direct opposition to that force. Also, in the pre-shot, it looks like there's no attempt to trace a Straight Plane Line. It looks to me like you're trying to trace a circle.

I would at least try to start with a Level Left Wrist. Then, I would go to Follow Through and see if you can get the Left Wrist Uncocked, when Tracing a Straight Plane Line.