I dont believe it requires either a change in posture or flatter clubs. The "flat" (right) Shoulder Turn isnt perfectly flat to the ground necessarily, its just as flat as is comfortable in my opinion.
See Standard Shoulder Turn , flat back and then down the TSP. It sounds a little counter intuitive but its a wee bit of Homers genius when you get into the TSP and its mechanical advantage. Its "flat" compared to a Rotated Shoulder Turn. (Although a Rotated Shoulder Turn can locate a TSP angle as well........but why bother?)
The TSP is a little complex at first , like all things Homer, but really, really worth the study. At issue is the Downswing Sequence and locating the best practical Plane Angle upon which the Right Shoulder can take the Hands (the sweetspot) down Plane in Startdown........what Hogan referred to as the all important "cross roads" of the swing, the transition from up to down. You want to get on your impact Plane as early as possible .......this is how to do it assuming you arent shifting to a lower plane.
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