I had surgery two weeks ago yesterday at Mayo and am the same as you except t3A with cribriform, IDC and Extra Capsular extension. I am on a Q3 surveillance plan just like you. I also have questions but I don't know if there is really anything else to do at his time. You have a shot at a total cure and they will monitor by PSA and be ready to go with salvage radiation and ADT, if deemed necessary. I am using this time to focus on a diet that help with preventing recurrence, but especially focusing on exercise to be in excellent shape for further treatment if needed.