If I understand this correctly, the shoulder turn is a flatter one in which the right shoulder traces the tsp into impact.
I'm confused on what is bold.
10-13-B FLAT
This is a relatively flat Backstroke Shoulder Turn which places the Shoulder “On Plane” for any Plane Angle with a flatter angle than the Rotated Shoulder Angle. A Flat Down-stroke Shoulder Turn can serve only to impact a circular motion to the Stroke, but almost irresistibly “Off Plane.”
10-13-D ON PLANE
After a 13-B or 13-C Backstroke Shoulder Turn, the Right Shoulder moves toward Impact precisely on the preselected Down-stroke Clubshaft Plane, establishing and supporting the Power Package Delivery alignments. When the Shoulder can’t quite reach the Plane, it is better to use a steeper Plane.
Hey, can I get in on this party?
In regard to 10-13-B FLAT. I believe your bolded "almost always irresistibly Off Plane" is the Startdown's equivalent to the pure Shoulder Turn Takeaway in Startup and the basic problem there in. Namely, the shoulders are not (given a Flat Shoulder Turn in startdown) traveling on the Inclined Plane and therefore are likely to take the Hands or Power Package with them on their off plane meanderings.
Pivot Chain and Sequencing etc demand that the Shoulders and not the Arms provide the initial movement in Startdown for Total Motion shots and so its best to align the Shoulders to the Inclined Plane in Startdown. 10-13-D On Plane. (In Startdown)
All of this suggests that the shoulders dont ideally merely turn on the same plane back and down. Flat Back gets the Right Shoulder closer to Shaft Plane relatively speaking (compared to Rotated which would have a higher associated TSP angle) and then On Plane going down. Luke described this to me as the right shoulder painting a reverse "7" on the back wall of his hitting station. Notice how the top of the seven is flat and then a diagonal towards the ball. This portrays a TSP which is on the Shaft Plane I guess. Straight Line Delivery Path which requires Hip Action.
So the 10-13-B Flat going back lowers the Right Shoulder some and then given a Slide Hip Turn, Axis Tilt in transition (or before, see Hogan) the Right Shoulder is further lowered to a Turned Shoulder Plane that more closely approaches the Shaft Plane for it move 10-13-D On Plane. If this TSP actually matches the shaft plane, then no further plane angle shifting is required, if it only approaches the shaft plane then a shift or shifts (the more shifts the more you approach Circle Path) will be required. But its less of a shift than if you didnt use Axis Tilt.
At least that is what I make of 10-13-D's "better to use a steeper plane". If Im correct, which remains to be seen, it should probably read something like "When the Shoulder cant quite reach the Shaft Plane, its still better to use this TSP plane angle than a higher one".
You know when you try to rewrite Homer you quickly understand his preference for brevity. Consider the previous paragraph a Wiki guys.
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