@dkapustin I think you're doing great, as others have said. With my second TKR I was in considerable pain for about 6 or 7 weeks but it pretty much lifted, almost overnight! I don't know if that will happen to you, but I was pretty darned discouraged when I had that pain, and my doctor was seeing me regularly. I think he was a bit concerned too.
I do water aerobics and water jogging, and resumed it as soon as my doctor said I could go in the pool again. He is also a big proponent of the exercise bike. He wanted me to ride my recumbent bike for a half hour, 5 days a week and then take two consecutive days off for recovery. I never did get quite to what they all want, 120 flex. I am at around 118 I believe. I have considered having a lysis, but do I really want to do something else to this knee? I am not sure. I think I might be able to be satisfied with what I have.