Guy
The positive is that your PSA is dropping. If you didn't have the super sensitive test you'd be on 3 month tests as it would be reading <0.1.
The Radicals trial is trying to determine if follow up radical treatment for high risk men who have had a RP is the best way forward..That could be RT or RT and HT.
Smaller trials have indicated positive results for adjuvant RT ie RT given after a RP before a recurrance and usually within 6 months of the RP. Of course there can be additional side effects. I consider myself fortunate as the adjuvant RT I had didn't cause me any significant problems.
I would see the oncologist who is running the trial and get an opinion from them.
good luck mate
Bri