Hey Dasyluo, sorry to hear of your diagnosis. It's quite a shock. It sounds like you're well begun on treatments, so that's important. With a high PSA, G9, metastatic, there's almost no way you could "over treat" this. It's kind of a hammer-and-tongs, kitchen-sink situation.
Maybe some of the guys who know more about
those two options will be along to comment. My G9 case was treated with radiation and hormone therapy, as it did not appear to be metastatic at the time.
I will welcome you to our G9 Crew, a gathering place for those facing this significant diagnosis. We have a thread you can look through, to find others with similar diagnoses, and various treatment plans. Here's a link, and I've added you to the list (in the 4+5 group, by diagnosis date):The Gleason 9 and 10 Crew - Welcome and how ya doin'? (Part 4, continued thread)
All the best to you as you work through the options, select and begin further treatments.