Tony, is the pain "between" your shoulders or spread throughout the neck, shoulders and upper back? Maybe a shorter reach stem/bar combination that allowed you to be a bit more upright will possibly help you. Only thing I could think of that could offer some possible relief. I hope someone can foigure this one out so you don't loose the riding years you worked so hard to regain.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13