My theory on tapering prednisone

I was diagnosed with PMR in August of 2023 so it's been about 10 months. I started on 15mg of prednisone but the pain was so bad I went to 20. After a month or two I went back to 15. After being stable on 15mg my rheumatologist told me to go down 1mg a month, but I thought that was too much too fast. Instead I went down 1/2 a mg every two weeks, and now that I am down to 4mg I am going to 3 and 3/4 starting today. I have not had any setbacks. My thinking on this - and this is what I want to share - is that going down a whole mg when you are at, say 5mg, is about a 20% drop (I'm terrible at math but aprox.) That is very extreme to my thinking. I wanted to pass on this idea, I have a pill splitter with a razor blade inside so it's fairly easy to make these divisions to the tiny pills. I wonder when I read about setbacks people on this (wonderful) support group have, if the reason could be the severity of the decrease.