Welcome @sslions, By PA do you mean Psoriatic Arthritis (PsA)? I don't have any experience with the condition but have had PMR flare ups twice and 20 mg prednisone was the starting dose both times and took care of the pain for me. You might want to take a look at the following discussions to see if it is similar to what you have?

-- Psoriatic Arthritis: https://connect.mayoclinic.org/discussion/psoriatic-arthritis-5/
-- What are the latest treatments for Psoriatic Arthritis?: https://connect.mayoclinic.org/discussion/psoriatic-arthritis-3/