Jim suggested two subtle moves which I am incorporating into my skiing, less pushing forward and down on big toe of downhill leg, more gentle pressuring and pushing on entire side of foot, progressive vs aggressive, and also subtle pull-back of foot that is becoming lighter (i.e. old downhill leg) as transition to new downhill leg begins; seems to work, better edge control i found but the strong leg heel slideout, so tails kind of skid out does happen so am consciously trying to keep toes down, when flexing forward.
Your remark about hip rotation caught my eye, since I try pretty hard to make sure I am facing downhill, or at the very least middle of next turn at each point of turn..that requires swivelling upper body to face the danger so to speak..
the other items about boots, well, i have serious "leg" issues, bowed like a lifetime jockey , and boot is at full cant (upper cuff adjustment) and have fillers on both insides of shins to push foot out further, at least 3/4" on right side and 1.5" on left side, have custom sole (surefoot though from 2009) and because of tendency to walk on outer edges of feet, also have lifters under sheath, so foot inclined inward. All these have definitely helped, with advice from instructor at Alta last year and bootfitter types thereafter there and in DV; and in SB, one of Jim's pals actually suggested tape on left outer edge on binding, experimenting with that now. This I'll say, funnily, Jim's progressive subtle move suggestions seem to go off now much nicer and smoother on weaker left leg.
Anyway, thanks, some of the foot technical jargon, am not that familiar but I think I understand ski technique quite well, just quite a ways from executing well !