99% seems very high, and while I'll agree you can feel a difference, I can't see how any position change is going to make up for a ski's general lack of torsional stiffness.
I really liked OldSchoolSkier's analogy to 2 F1 drivers switching cars and it reminded of a story about Juan Fangio getting irritated about a fellow driver on his same FI team (Ferrari) demanding virtually all of the mechanic's energy to make many adjustments to his car to the point of ignoring Fangio's requests for mechanic time, and still being slower than Fangio. The other driver finally complained that Fangio had been given the faster car, and there was just no way he could be as quick. So Fangio then jumped into the other driver's car and put down a lap that was substantially faster than he had been able to do in his own car, and further broadened the already large gap between the two drivers. When the other driver, who was now humbled by what he just witnessed, asked Fangio for any advice - Fangio just said "more throttle, less brake". Not a matter of driver style here, just a quicker driver!