My pain is pretty much all the time, as well. Although it varies throughout the day - much worse in the early morning, gradually improving through the day and then back to the same level the next morning.
Any changes in pain level I attribute to changes in medications - I have had no evidence of 'flares'.
My ESR and CRP correlate pretty closely to my current pain levels. When they're high, I'm in bad shape. When I could barely get out of bed (at least not without crying) my CRP was over 100.
