I too have found the feel of the lower body/hips going slightly forward on the backswing gives better results. It feels like this "sets" the lower body to drag the arms forward and at the moment it is one of the hardest things for me to remember to do. When I don't do it there is a tendency to come forward with the upper body in the downswing and hit ugly shots. I think this move is related to the forward press at the start and counter balances the arm movement in the take away.
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