@wfrolansky:
I had the same experience with morning hand and finger cramps and pains as I tapered below 10 at 1 per month to 5. An x-ray diagnosed mild osteoporosis which evidently had been successfully masked prior to PMR by my natural cortisol production. Somewhere around or below 5, it went away and has not returned. Now down to 1, having tapered at 0.5 per month. Only issue is occasional mild rotator cuff pain in one shoulder, which developed sometime around 3 or 4mg. Best of luck. Patience is required.