Well i haven't played a gig yet, but we play at a practice studio and I have no mic on my cabs and it's as loud as gig levels. I also have usually 1 cab at my back 5-10ft pointed at me, and one at my side maybe like 10-15ft point usually more away at the drummer. I get a little feedback if i sit with my volume pot all the way open and turn towards them, but other then that no squeeling or crazy issues. It sounds like the same old song and dance but less gain is the way to go. I'd really try that boost, if you like your tone more you'll want less gain to make it sound better. Kind of like when you have a crappy burger you end up putting on more things to enhance it and it's a big sloppy mess in your hands, but when that burger is perfect it doesn't need a thing