I agree with @jeff97 that it does seem a little to fast, especially if you have back to have more pain. My Mayo rheumatologist worked with me on my tapering schedule and let me use my level of pain in the morning as a guide as whether to taper to the next lower dose or not. My first time around with PMR was 3 and half years and the last six months was going back and forth between 1 mg and 1/2 mg prednisone until I could finally stop taking it and my pain in the morning was less than 2 on my pain scale and generally went away once I started moving around a little. I like the information in this discussion started by @dadcue who might also have some thoughts for you:
-- How to Slowly and Safely Taper Off Prednisone but ... no set rules.
https://connect.mayoclinic.org/discussion/how-to-slowly-and-safely-taper-off-prednisone-but-no-set-rules/