I have also been reaching back further after watching Will's instructional video. I had always based my reach back on an overhead perspective video of Feldberg driving where, from above, he looks like superman flying directly away from the target at point of furthest reach back. So Feldberg's shoulders never seem to rotate past perpendicular to the line of play at the furthest point of reach back. But, based on Will's video, I am no longer reaching back with both arms, but am instead hitching my left arm up to my side the way he does and rotating my shoulders past perpendicular to the line of play. I do seem to be getting a bit more distance, but I am working through some control issues. Scores, however, have never been better, but I feel like this driving technique is putting more stress on my body. I've never had pain in my right hip like others complain of, but now I do, and my arm feels like it is going to fall off. I have trouble picking up a gallon of milk for a few days. That sort of thing.
From Paul McBeth's videos, I don't see him reaching the same position as Will at furthest "backswing." In other words, his shoulders seem perpendicular to the line of play, like Feldberg's. But it's a little hard to tell. What do you think?