[Mathew]

Actually, I did make a mistake on the angle increasing. Mike O your quite correct - I did mean that it gets smaller on the V made by the upper arm and the lower arm...

Anyways...lol

Now since the right forearm is directly onplane at impact we can now know why you can't zero shift the turned shoulder plane and have the right shoulder onplane at impact and the right forearm also on that same plane. The only way that this can happen is a)the right arm is fully straightened or b)the plane of the elbow bend is the same as the inclined plane (push basic stroke) - not really good options...

So lets look at how you can get the right forearm directly on the inclined plane at impact.

The straight line of the triangle that goes between the right shoulder to the hands always stays on the inclined plane and the angle that the right elbow plane goes through the inclined plane being a factor on the right forearm position (vertical furthest away). As an approximation the length of the right forearm and the right upper arm is about the same - so relative to the plane of the right elbow bend plane - the angle on the right upper arm to the forearm will be double the degrees that of the angle of the shoulder to hands to the elbow. The only precise way would be to measure accurately and use simple trignometry.