I know that the Turned Shoulder Plane is the recommended plane angle per 12-1-0. But can you execute an effective Hitting Procedure from all three Basic Plane angles?
The key to successful Hitting is the Delivery Path, not the Plane Angle. Specifically, the Hitter should limit his Backstroke to the Top of the Straight Line Delivery Path (10-23-A) and avoid the Swinger's End Stroke, that is, Top Arc and Straight Line (10-23-C).