If I am understanding you correctly what you are saying is:
1: My back swing is too flat.
Your Backstroke is Aroundish.
I am on the elbow plane going back
Kind of, but that's irrelevant.
and my over the top move is an attempt to get up to the TSP.
No. Your over the top move is caused by your hips and shoulder alignment.
2: I need to focus on getting my shoulders to move vertically in both directions.
No. You need to stop going aroundish and use the Plane Line.
3: I'm too flat with the shoulders going back. Yes.
4: I'm over the top because I'm attempting to not be too flat going forwards.
You're over the Top because your shoulders and hips are aligned that way.
All that I'm asking you to do is to get into your address position without a club. Then, move your right foot back (away from the target line) a few inches or more. This will move your right hip out of the way so that your shoulders can turn without going around. Your spine will not move or sway or tilt. Your head should remain stationary. Lastly, move your hands to your right and up. Try to trace the Plane line.
This will re-align your shoulders and Hips and you will no longer come over the top.
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