@david_ski, interesting experience you had, maybe it is not the distance between your feet - but the fact that you are overall longer back on your quest - I have a Quest as well, and when I worked on the fin/binding setup in the spring it seemed that "everybody" in here moved the bindings BACK - not front like you. My point is: is it the distance between your feet or is it the overall (mid) position on the ski that makes the difference ?
I think that the closer your feet is - the faster the change of weight-distribution on the ski.... and maybe all new ski's today ski better with constant weight distribution or slower weight transition than "in the old days" when we added a lot of pressure on the front in preturn and quiqly moved back at the finish of the turn...