Roy,
I started HT 9 nearly 9 mths before RT (37 fractions, total 74Gy). PSA was never high - 5.2 on diagnosis and dropped to around 0.1 with HT. Just before RT it was 0.097 and immediately post RT (mid-May 2014) fell to 0.024. There has been no suggestion by the oncol that I should cease HT, in fact I've been strongly advised to continue...indefinitely.
As the medics keep saying, we're all different. One big difference between us is that I haven't had RP. While HT has side effects, I've come to terms with them and will continue with RT.
Viv