Startech,
I am a G9, but a 4+5, so you'll be a bit worse than me in the "aggressive" category.
The path was ugly (you have substantially more % involvement than I did), but as far as EPE, I had multiple points. That said, I would say we were pretty close to the same. Based on the 4+5 and EPE, I went to IGRT as adjuvant without waiting for a PSA rise. I suspect your Uro will suggest the same thing.
As to the size - with the ultrasound at your biopsy, it is a rough estimate. From the path report they weighed and measured.
T2 to T3 - not uncommon to have a change, as that diagnosis stage is based only on what can be seen with tests, and the path is definitive.
We all hope for better. I was prepared for a G 4+4, and that added 5 just put in stone what I was afraid of. My EPE was extensive, so I'm not surprised that it got out into my system. RT may hold better prospects for success for you, with the lesser EPE.
Can't offer suggestions, not being a doc, but I'll offer my experience if you have questions.