Dear Mark,
Your body posture in gravity and your stroke movement is gravity is more important to straight strokes than putter fit. A good putter can putt with any odd putter lengt and lie so long as he has good setup and motion. Don't fight gravity in either the hanging of the arms and the movement of the shoulder action in the natural gravity plane. Then the coupling of the hands onto the handle will take care of odd torque forces back inward at your body, as the hands always do. Once set, forget the hands and make a good on-plane shoulder action or at least one that does not seriously pick a fight with gravity.
Your question has embedded in it the "tail wags the dog", so get past that. You swing the putter with your shoulders, arms, and hands. Swinging these body parts is swinging about 7-8 TIMES as much mass as the whole putter, and the center of mass of the whole is not "out there" at the end of the stick, but much closer in to your elbow height in the setup structure. Swing that center of mass with a good setup and motion. A simple grip muscle tone of about 3 on a scale of 1 to 10 handles the oddity of putter lie.
Yes, you can optimize putter lie etc., but first things first, always. Dog wags tail. Putt. Play golf.
Cheers!
Geoff Mangum
Putting Coach and Theorist
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