Thanks guys, I'll have another play tomorrow.
His Muffs were Cornish modded to cut out the low end flub and fine tune mids.
A simple start would be to set amp drive just below breakup, lower the bass, increase the mids and start experimenting with the muff drive vs the amp drive levels. I would then add light compression in front and then consider adding and EQ post amp. Add a simple single delay with several repeats and a big reverb mixed to not completely wash you out.
I like to go back to the amp drive after doing the above and sometimes increasing it into more drive will get you into that feedback sustain happy space that his lead tone lives on the edge of. Adjusting the Amp settings (in particular definition, clarity and compressor) can also really shape things a ton.
Any way I can mimic that on the Kemper, or do I just do it by putting an EQ block after the Muffin stomp?