OK, sorry. That was a bit rushed, and I left a few important things out. Like it took me three tries to get fitted properly. The first one was on the fly as we were at Sutton and thought the bulk of the problem was my lack of skills. A footbed was put in with more wedging under the insole and a heel wedge that helped stop a hot spot on my foot but didn't help correct the edging trouble. The instructor really didn't help either by insisting for 5 days that my skis were too long (I've since proved him wrong and can't wait to show him so).
The second attempt was at a ski shop (where I originally bought my boots and have great respect for their technical know-how) that did only a further cuff alignment (to the maximum allowable), using a pivoting protractor (half-cylinder you stand on with an extension up to the knee). The knees looked OK once the cuff alignment was done and felt fine in the shop. However, once it was taken to the slopes, it turned out the adjustments had only made the problems worse. I'll never forget looking at Comprex, with me nearly in tears, after several terrible runs and saying, "I KNOW I'm better than this!"
Obviously, something else was the issue. Semi-custom footbeds with heel wedges and cuff alignment to maximum allowable have not helped. I've been told by one instructor and two trained bootfitters that the problem is elsewhere (skis too long; out of shape; not enough time on skis).
The problem was, this is a chronic issue with me. The edging problem shows up in my skating, too. Sure, it could be me, but I could tell from the problems I was having on my skis that it wasn't. It had to be either the boots or the skis, if not both.
With that in mind, shims of duct tape were inserted at the boot/binding interface. That seemed to work, and there was some hope that the "undercanted" theory was correct. The confirmation was when the third expert bootfitter, a race team fitter, looked at the boots and the work done thus far. Using ankle range-of-motion tests and shimming wedges (devised by Green Mountain Orthotics), Brian B. of SkiCenter in DC confirmed the heel wedge and instep control, and suggested 1.5 degrees to 2 degrees of canting in addition to the boot cuff adjustments.
Moral of this extended story - if you go for an alignment evaluation, you STILL don't like the way your boots fit, and it's not your skills holding you back, go for another. And another. And another. Until you've got things working the way you want them to and the way they should. Because it took me eight months, three bootfitters, and several different attempts to get mine to work.