Just to put a cap on things, I had my last PT session on January 28. My PT said it was probably the easiest rehab/recovery he has ever dealt with from the first session on. At that time my flexion was 120. I did stairs one foot in front of the other, both up and down, the day I cam home from my first PT session. I was measured at 140 at the end of my last session with my "older" knee done last March just a degree or two less. Both can be perfectly straightened.
I have a follow up with my OS on March 17. In the meantime I am playing golf whenever the weather permits and going about any and all daily activities with only occasional stiffness or "achiness" if I truly overdo it. I continue to take a mix of Advil and Tylenol when needed but nothing on a regular schedule. Even though neither of my knees feel like what I would call "normal" at this point I will take what I have any day over the pain that I had in each prior to replacement.