@giordi
If that was your first PSA test at 3 month mark you are doing great. That is a very significant drop.

My R/O stated it will take 1-2 years for your PSA test to get to lowest mark. He stated as long as going down that is what they are looking for. So in my opinion and from what my R/O and PCP have stated about PSA testing you are doing great at 3 month mark.

Did they tell you that your prostrate is going to be really irritated for some time because of all the radiation. So it takes time for that irritation to go down. I was gold below 1 is goal and again was told that could take 1-2 years to get there.

Did you take ADT? I did not and had 30 rounds of proton radiation at UFHPTI and have my 1 year mark coming up. My last PSA test was .60.