Hi Kevin
There have been a few cases I have read with a lot of pain and it took a year or two to get better. I know there are many reasons for pain and I am not a doctor so can't tell you more.
I do know that with several of the very bad cases, it took a lot of patience and they finally did get better. I don't think they ever got 100% like most of us do, but they did get rid of much of the pain.
I only tell you that because you have choose the path to wait and see. I can't blame you for that. Another surgery to a THR would certianly be another big upset.
Many people have been helped a lot with water therapy. Maybe that would be something you could try that would not cost a lot or be another surgery. A good PT in water therapy might be able to give you some stretches and exercises in the water. I was able to use a large neck deep therapy pool kept at 92 degrees. It really helped to loosen my mucles up. Here are the ones I did along with just some plain water walking forward, backward and to each side.
http://www.surfacehippy.info/poolexercises.phpThat's my best suggestion at this point since I know it has helped a lot of other people.
Please keep in touch and I will keep my fingers crossed that you will be able to solve your pain problem.
Pat