I to have one from 2004 and I am looking at doing what you have done. I have a tech who will do the work ie negative feedback ( Moyer mod). I really am thinking about going to Vibroverb circuit changes.

I bought The “CVR” and put it through some modification that really helped. After a quality re tubing, I had all caps replaced with F&T and other highest quality caps. This quieted the amp down a great deal. It was a John Fromel “Supreme Cap Kit”. Then I had the second Fromel kit installed. This kit contained “The Moyer Mods” plus other changes to the tone stacks to the degree that it’s now a “Vibroverb” circuit.This brought out the reverb, ended the very early breakup quite a bit. This is the only Fender product that I have owned that actually required modification for me to like it. Channel one is brownfaced while channel 2 is blackfaced. It has the most beautiful tremolo I’ve heard. The 10″ P10R’s are fine for now. If I needed to turn it up substantially, I would perhaps disconnect those and use a 2×12″ cab.