For sh!TS and gigs I tried a few Shiftline cab IRs and poweramp combos using the 2 overloaded poweramp IRs (KT66 and 6550). I misunderstood and assumed they would have an overdriven sound. They kinda don't, it's more they add some high harmonic content. They sound really cool. My fav combos are still the Sunn 215 and the Hartke 410.