Does not the loft of the club increase when one tries to hold the backside of the left hand against the sky and the palm of the right hand against the ground, far into the downswing to delay the release?
Uhmmm I think the left wrist should stay flat, on the same plane. From a place viewed (the front side) the clubface, the left wrist and the side of the arm make, are all in, a straight line. As long as experiments don`t change this... keep going !