You have expounded before on how the arms must be relaxed even during the downswing in order to achieve the optimum reflex action, ie, transfer of leg-generated power to the hands. I have been concentrating on relaxed arms (at address) in my preset half backswing with promising results. Maximum reflex action seems to occur when arms are in their most relaxed condition when downswing begins. There is a conundrum here however, and it may be the source of why some forum members don't 'get it' when you have written about relaxed transmission muscles.
First, how do you get the arms from their low position at address to the higher position at top of backswing--effort must be expended to get them there? In GtTB Blake wrote: "The swing is started by an instinctive movement of the legs, which push the club straight back from the ball." Even if the legs are doing the pushing, the arms would must have structure/contraction (not be limp) in order for the legs to push them back. Do you agree that the legs push the club back from the ball? From the top, assuming a good trail elbow position has been maintained, the legs can drag the arms/hands down and through impact. Again, wouldn't the arm/hand assembly require structure in order for it to be dragged down by the legs? If the arms were totally relaxed (without structure) at the top, how could they be dragged down by leg action. It would seem that an intricate balance of relaxation-contraction of arm muscles would be necessary to achieve an optimum reflex action.
You posted a while back that you intended to experiment with Mindy's grip change. Has that that worked out? Jim