I always had low BP, but was recently diagnosed with complex regional pain syndrome. I now see that my blood pressure is at least ten points higher and my pulse went from being in the 70's to over 100 while resting. Last night was my first night of sweating for no real reason, yes, it is hot out, but not the way I was sweating, I was relaxed but in a great deal of pain, I took my BP and it was 134/80 (it was always around 117/65) and my pulse was 107.
You are a very strong individual and a role model on the right attitude for dealing with chronic pain.
In my experience your HR is a bit high, but I am considering you HR against my own experience and I suffer only from heart rhythm and related heart problems.
HR under physical load does depend on physical condition, that is someone who can train to run the Marathon must have/develop an exceptional cardiovascular system, and will have lower HR for any given physical load than do the rest of us.
I think you may be on to something in trying to find a pain management tool via monitoring HR. This may be worth "publishing".
Sorry, no solid data from me, but others may have something and many may be interested in your conclusions.
Keep up the good work/strength.