The Sweet Spot Plane in of itself does not define the Inclined Plane Angle or Inclined Plane and in fact I can't establish an incidence that you would want the Sweet Spot Plane to define the Inclined Plane. The Club shaft Plane Angle and Inclined Plane Angle are by Homer's definition always parallel.
The Sweet Spot Plane Plane Line (base of Sweet Spot Plane) is not the same as the Inclined Plane Plane Line (base of Inclined Plane). The discussion with regard to the Sweet Spot Plane vs Inclined Plane is really a discussion of 'Feels Like' vs 'What Is'.
The base line of the Inclined Plane is not the Plane Line that is used for tracing. The Plane Lined used for tracing should be the Impact Plane Line which is often as the Target Line.
So is this something everyone else just knew, learned or just accepted?
Also if anyone has some references to clear up the what appears to be conflicts above I would be interested.
Very encouraging stuff Martee.
Let me give a few references as you said...
So there is a “Clubshaft” Plane and a “Sweet Spot,” or “Swing”, Plane. But herein, unless otherwise noted, “Plane Angle” and “Plane Line” always refer to the Center of Gravity application.
SWEET SPOT
Example – a plumb bob.
Mechanical – The longitudinal Center of Gravity of a length of material.
Golf – The spot on the Clubface through which a plumb-bob line would pass if suspended from the Grip area.
I stress again: "...unless otherwise noted..."
An example of this would be in 2-C-1 #1 where the Inclined Plane is not the Sweet Spot Plane.
But otherwise, the Inclined Plane is the Sweet Spot Plane. And Plane Line is the Sweet Spot Plane Line.
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