Dear James,
The backstroke is best if straight back, but if it's a problem, then the priority is on staying relaxed with dead hands and don't worry too much about it -- stay focused on the falling back of the putter to the square address position and on timing the casual uplift of the lead shoulder thru impact.
One suggestion to help get the hands back online without fanning open is to feel as if you are pulling a lawn-mower crank cord & handle straight back with your rear palm. Actually, back and up a bit. The trick is to imagine this cord attached to the lead shoulder socket via a pulley between the feet so that pulling the cord back also pulls the lead shoulder down and back in a coordinated way, in which you can't tell whether the hand is pullng back or the shoulder is pushing back.
Another idea is to "drive" the lead shoulder down and back above the balls of the feet.
Another is to imagine pushing the palm of your lead hand with the lead shoulder towards the instep of the rear foot going back, and then reversing this with the other palm going forward.
And you may have to bend the top of the torso a little more over, so that the shoulder frame is cleared out from your chest more. This makes it easier to turn the shoulders a little further in a vertical plane, without the lead forearm wanting to roll open as the elbow comes in conflict with the abdomen.
Cheers!
Geoff Mangum
Putting Theorist and Instructor
Geoff Mangum's PuttingZone
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