Let me ask, do they move you up if you show improvement? I am a little concerned about how people state they don't really provide too much feedback. I've skied Gauthier and different portions of the East Wall at A-Basin, Prima Cornice at Vail, highlands bowl and a few other difficult trails without too much trouble, but like mdf was saying, I'm sure I'll be told my technique sucks. Which I'm ok with! But only if I'll get feedback to improve, rather than the coaches expecting me to improve on my own by picking up stuff from the other skiers in the group.
I'm definitely timid as well when it comes to new double black terrain I've never been on, until I ski it once or twice and know what to expect, then I'll get more aggressive. While I'd assume the coaches wouldn't lead us off of a cliff without a forewarning first (Do we ski in line and they watch us come down, or do they wait at the bottom and let us take our own line?), I'm not sure if they expect us to be super aggressive in unfamiliar terrain at first.
They shouldn't have to move you up if you show improvement, because everyone is supposed to improve.
Seriously, the coordinators come around at the first lunch and ask if anyone feels they wound up in the wrong group. And they move a few people around later, if a mismatch becomes obvious. There is a lot of room for varying ability in the camp. They are going to push you, but not beyond what you can do.
I would have reservations about taking regular, non-camp lessons during a camp week. It soaks up a lot of instructors, and it's a high-prestige gig, so most of the instructors that can work the camp do work the camp. (Some exceptions, notably our own TetonPowderJunkie, have scheduling conflicts, but still, as a rule...). At my last camp, there were two sections at the top level, four sections in the next level, and lots of sections in lots of lower sections I didn't count.
I wouldn't worry too much about the "don't really provide too much feedback." If you have big technique issues they will tell you. But most people at mid-level and above have more subtle issues (commitment, line) and they work on that.