I have a Blues Junior with a couple of the Billm mods too. I bought the amp from some guy who did the cool mod with the one resistor swap. It's a lot clearer sounding from a stock BJ with that mod. I myself did the twin stack. Easy to do and makes the mid knob more useable. I also swapped out the stock Eminence for 2 speaker choices...one being the Jensen C12N and the other a Warehouse Guitar Speakers Veteran 30 (a Celestion Vintage 30 knockoff). I agree that the Jensen C12N produces absurdly good Fender clean tones but I found for my purposes that I prefer the sound of the WGS Veteran 30 because I like to play with some overdrive and all out distortion and the Jensen (to my ears) was too shrill. Anyway FWIW....
Guitars/Bass - MIM Fender Classic 50s Strat, MIM Fender Standard Strat, Squier Classic Vibe 50s Tele, Gibson Les Paul Studio, Epi '56 Gold Top Les Paul, Martin DSR acoustic, Sigma Martin Auditorium electric/acoustic, Squier Jazz Bass.
Amps/Cabinets/Modelers - Model 2558 50 watt Marshall Silver Anniversary Jubilee combo w/ Celestion Vintage 30s, 4x12 Marshall cabinet w/25 watt Greenback Celestions, Fender Blues Junior w/ a couple of Billm mods, Line 6 POD 2.0, Roland Micro Cube
Pedals/Effects - Cry Baby Classic Wah, Boss TU-2, Boss NS-2, Boss RC-2 Loop Station, Ross Compressor, MXR Micro Amp, Danelectro FAB Echo, Danelectro FAB Chorus, Danelectro Chicken Salad, Marshall Guv'nor Plus, Marshall Echohead, Duhvoodooman's Zonkin' Yellow Screamer, Digitech Digiverb, Digitech Bad Monkey, Dunlop Fuzz Face, Homemade Loop Bypass pedal, Duhvoodooman's Sonic Tonic (Maxon SD-9 clone +), Voodoo Labs Superfuzz