So, the show went well last night. There was not NEARLY as many people as they thought were going to be there. More like 50 rather than 150, but we got paid all the same. The Mark did very well. We had some power issues so the bass and my guitar ended up not being miced, but even though the thiele wasn't mic'd my fiance said my guitar was coming through the mix just fine and she could hear every note very clearly, so I was happy to hear that. Anyway, I was very happy with my tone overall!
rabies: I ended up leaving it at 2 as to not mess up the mix. There was apparently not enough power on the circuits in the room to power the power amps for the PA speakers so we had to take some stuff out of the mix to leave room for the drums (via triggers) and mics. I thought I could turn up a bit, but 2 was scorching as it was, and it seemed to be mixing with the band just fine, so I left it. I would have loved to crank it on up though! But, even at 2, my left ear was starting to feel the effects of the thieles pumping out tone. It was not a huge room, and we weren't trying to be over the top loud like a Motley Crue concert or anything, so it worked out. Haha.
fpoon: I wouldn't advise plugging the Mark straight to the PA, even from the direct record out. I had an SM57 in place on the bottom thiele on axis and about half way b/w the center of the speaker and the edge. 2 on the Master was loud enough for my rig to be miced, but I guess depending on the cabs you are running your results may vary. But, like I said, they ended up pulling the guitar and bass out of the mix.
stonedkirby: Good luck with your gig search! Try to save your hearing for the stage. Haha.