Another update on my situation. I continue to get quarterly hormone injections. The last two were in early May and August.
Before each injection I get a blood draw for the PSA test. In May my results had dropped from 0.21 to 0.07. In August the number had dropped again, albeit only to 0.06. Other than needing a periodic tweaking of my BP meds, I feel great. The best that I've felt in over a year.
My doctor says I can ride as far and as fast as I feel like, with no restrictions. So far, I've been keeping my rides to 50 miles or fewer. I need to bust past that mental block.