Mr Titleist, welcome aboard.
Do you have the yellow book? There will be some interesting things for you , there in, given your previous training.
Research these topics first in the book and then around here using the search function. Maybe confine yourself to Yoda's posts for a while.
-Axis Tilt.
-Turned Shoulder Plane
-Standard Shoulder Turn
-Rotated Shoulder Turn. (And note that if you "bump" so to speak you cant really maintain the Plane your shoulder's turn on........as the right shoulder must drop down somewhat, "Axis Tilt", a very good thing. Meaning that you can only truly keep the shoulders turning on the same plane for non weight shift strokes)
- Hands controlled Pivot vs Pivot controlled Hands.
-Divergent Vectors.
-Right Forearm Takeaway. Right Forearm Pickup. Fanning and Bending. Pressure Point #3. Tracing.
-The Sweet spot Plane and how the #3pp attaches to it.
-The Inclined Plane.
-Plane shifts.
Mr Hardy has I think a different meaning to the word "Plane". So you'll have to sort that out first.
Here's a video to noodle over in regard to the Plane and Plane Shifting although there are numerous other types of shifts or a zero shift, not just the one animated here.