let me just say that the first time out with my 744 I ran levels up to -6 or so (24b/88.2) (thinking that as long as I didn't hit 0 everything would be ok), also running the limiter, and I have faint diginoise all through the first set, when the limiters were engaged. Luckily, the 2nd set, I turned off the limiter and dialed down my V3 a notch, and it turned out ok. This past weekend I taped several shows (no limiter) and tried to peak at -12 or sometimes it would hit the first red light. Listening back to the show it turned out very well, and from now on I will be running it to -12ish. Take all this with a grain of salt as I'm still new to it, but, I'm glad I ran a second set of mic's for that first show because otherwise I would have ruined the first set. This unit should have low enough noise that if you have to boost levels in post it shouldn't be a problem as long as you're running to -12, I know I've learned my lesson about trying to squeeze every db possible.
My .02