You should keep an eye on your blood tests. Ask the Dr for copies and where to look for ESR and CRP results and what is normal. You may have a relatively low level of inflammation and the Dr doesnt want to slam you with high dose Pred and set you up for unnecessary problems trying to get off it.
There are a number of conditions that can mimic PMR and may not require Prednisone and if your inflammation levels are increasing, there are a lot of things you can do to help control it. Lots of research needed !!! Good luck.