Going for brachy said...
I have chosen to undergo cyberknife because it offers chance of cure, no matter how small.
I hear you, there, brother. I can't imagine how it feels to think it was "only" G3+3, then to find out that it has a nasty streak. I think I'd opt for CK, too, just for that chance. . .
I'll be watching your progress. BTW, which CK center are you using?
Age 68 at Dx
PSA history: 2000-2012 0.9-1.2; 06/2012 started T replacement
2013-2015 3.0-3.3 (new normal)
Biopsy: 12-core biopsy 07/2016; 3 cores G3+3, 5% or less; 1 core 3+4, 15%; 1 core HGPIN; 2% of gland involved. Summary G3+4.