"I went down to 8.5 on Monday, and gradually feeling more pain, day by day"
That is a clear sign you are not on enough pred - to me is also suggesting that you had some pain at 9mg? Whatever your symptoms level was at the start, whatever dose that was, is your guide to the future: that is what you are aiming to stay at, you should never feel worse at the end of a taper step than you did at the start. You need to do the flare protocol and go back to at least 9mg - but only if you were pain-free there, I know you felt better.
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