I'm also left hand dominant, since I started playing. And I also have trouble with the inert left arm. Right handed thoughts make me feel like I'm throwing it away.
I am in the same boat - I felt like I reached my power limit hitting lefthanded tennis backhands.
I learning to keep the right arm/hand shaft on the inclined plane board - keeping the left side dormant - (this is what I feel). Lots of right forearm With a big hinge/swivel feel into impact. Watching the Tomasello letter videos helped me. I have also tinkered with the driving right shoulder bent right arm - the move totally removes the fell of the left arm.
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