archtop_fjk
Tele-Holic
Tell me about this. By PM if you prefer. The individual volume controls double as tone controls. I manage quite well with that. But I lose fullness and volume higher than the 7th fret.
Here’s an example via Stew-Mac. You could install this active preamp where you mud switch is currently. One issue would be where to locate the battery but that could be solved. There are other similar boost circuits you could consider as well (e.g. Clapton mid boost).
https://www.stewmac.com/electronics/components-and-parts/preamps/emg-pa2-preamp-booster