I have only been on Prostap for 7 months and so can't help with your query but wondered if you could answer a question for me.
Did you experience any lower back and hip pain when you started the Prostap?
It may not be related but this pain has only started in the last few months.
The good news is that a RALP and salvage RT didn't get me down to undetectable but 3 months of HT has done the trick.
Sorry to highjack your post but with your experience of Prostap you seemed a good guy to ask.
All the best
Kevan