Thanks for the reply and I know it must have taken you some time to write it so your time is appreciated. I think you may have nailed my problem without even seeing me swing a putter. I do in fact move my hips ever so slightly during the putting stroke. They move in response to my torso motion and I've done it for years. I didn't know they had an affect on the putter face else I would have been working on eliminating their motion instead of ingraining it.
After reading your reply I got in my putting stance with my buttocks against a wall and made some strokes using a putter. I could instantly feel the muscles of my back working and it was a upper body putting stroke feel compared to a hips and shoulder putting stroke feel.
I will work on keeping the hips steady all this week and will see how it goes next weekend.