@mezack25 Hopefully splitting the dose will help you, but if it doesn't it seems like you might have dropped too low to keep your PMR under control. I have read that up to 20 percent of people have normal blood markers initially or during flares. You might be one of those people.
Also, 8 or 9 months of treatment isn't very long for PMR. A lot of people need 2 years or longer before their PMR burns itself out. If you drop too low on prednisone, you might be hurting for for a long time before the PMR ends. I was sick with PMR for about a year before being diagnosed, so I know what that's like. I tried treating it with Tylenol for arthritis, and that didn't help much.

I had rotator cuff problems in one shoulder plus a lot of stiffness in my neck when I had undiagnosed PMR. I had tight muscles for a while when I was tapering prednisone, so your hamstring issues could be from the prednisone.

If you keep having a lot of pain, you could ask the rheumatologist about going up a little on the prednisone and seeing if that helps.

Did you have much pain when the prednisone dose was higher, like at 5 or 7 mg?