PSA rising, RP 21 years ago, salvage radiation 6 year ago.

I'm trying to fugure out if I should look for some agressive treatment, or what.
I was 56 when I was Dxed. with PC and now am 78 in good health, except for
erections, normal aches and pains.
I had Radical Prostatectomy June 26, 1990
My Gleason score in 1990 was different than now, and was listed as 2+3=5 with
extensive perineural invasion. Also listed as stage C, T3
After the RP, I was tracked by my oncologist for 10 years with PSA still
undetectable. He released me and said he didn't think it would ever return.
On the 12th year my PSA test was 0.1, PSA gradually elevated to at the 15th
year check it was 0.6.
I checked back with my surgeon, who sent me back to my oncologist. At this
time I was told I should have salvage radiation treatment.
The 42 treatments was done with a newly installed trillogy machine.
Radiation Treatment for return of PC started on 10-19-05. I took 42 treatments.
PSA dropped to 0.1 after treatment, but now is up to a 2.9 as checked 11-8-11.
Six months ago PSA was 2.3 and Dr. Vukov thought I
should wait another 6 months and see how much the PSA jumped.
I am looking for information on what course of treatment I should be looking
for.
As of last year, no metastasis could be found anywhere in my body.
Thanks for any information you can offer.