It definitely helps to have the instructor give the boot fitter some idea of what sort of boot problems the instructor sees. But usually, that has more to do with alignment problems. I'll usually write down the alignment problems I see on a business card, and have the person take that to the boot fitter (BF). That way, the BF has somewhere to start looking for alignment issues. I note things like "has a hard time getting onto inside edge of left ski" or gets hung up on inside edge of left ski", or something along those lines.
Since you are in New England, I'd recommend going over to Stratton, and seeing Greg Hoffman or one of his techs at GMOL (Green Mountain Orthotic Labs). These guys are so good because they do lots of PSIA big wigs (D-Teamers and such), and get lots of feedback about their work. A lot of the local shop folks, even if they have all kinds of certs and stuff, usually just do your average "Joes" and "Janes" who never know if what the BF did was actually right or not. So they always think they did a good job because of lack of feedback. The folks at GMOL do people who know what the hell they are talking about, so when they make a change that isn't perfect, they hear about it, and learn from it.
Edit: I'll add that instructors are not boot fitters. We can see problems, but we can't always determine why the problem exists, when we are on the hill. A ski instructor should give the BF info and maybe even recommendations (if the instructor is VERY good), but should never tell the BF how to do their job. So I'd be weary of having an instructor dictate a solution for you. Afterall, I may be in shape, but I wouldn't begin to think I could tell someone else how to condition themselves better than a conditioning coach can.<FONT size="1">
[This message has been edited by JohnH (edited April 26, 2001).]</FONT>