Position is power as you’ve seen.
In the beginning it will be a very conscious thing that you will need to think about alot.
As you are working with it  it will become just what you do.
You are breaking the old positioning habit and creating a new habit/positioning.
What are you doing to address the difference in muscle development side to side?
It’s Not Just Absolute Position, It’s Stability as Well
The Biggest Shoulder Problem of Them All Part 1

Watchinf this webinar can help with your understanding of how the shoulder works.
The Athletic Shoulder: Anatomy, Physiology & Function