[KevCarter]

TSP limits the amount you can load PP#4, which takes some 'mass' out of the force created and lessens #3's transfer power.

Agreed that it is easier to master (a left hand karate chop to plane, focused on #2).

In a nutshell, TSP is less powerful, but more accurate.

Kev - a flat downstroke turn creates too much 'out', and makes it difficult to stay on plane.

I agree, that's why I believe YODA teaches Standard shoulder turn which is on plane on the downstroke.

10-13-A STANDARD
This is dual application of the Flat (-B below) Backstroke and On Plane (-D below) Down-stroke Shoulder Turn.

In my opinion, the flat backstroke shoulder turn is wonderfully compatible with the MacDonald drills.

Kevin