Red Boar,
Your post could easily be a description of myself- Right hand shooter, left eye dominant, split finger, glove, and a lifelong problem with consistent follow through. I have learned that above all else, I must concentrate on not dropping my bow arm until the arrow hits the target. If I fail to focus on keeping my bow arm up, my arrow will remind me because it will be about 4-6 inches left of where I was aiming.
I finally broke the bad habit by shooting just one single arrow every few minutes with total focus on form. Eventually correct form replaced the "programmed" bad form in my subconscious. The tendency is still there though and every once in a while I have to go through the mental exercise again. Usually when it happens I'll just stop shooting for the day or at least for a couple of hours.
Bad form can become instinctive just as proper form can be and like any bad habit, the longer it goes on, the harder it is to stop.
Hope this helps,
Ron