At a "Dev Team Prep" clinic at Stowe last week with Matt.
Key thought for two days: athletic stance is probably much lower than you think it is; shin angle should match spine angle (fore-aft).
We worked this through a series of drills: one legged railroad track turns, one-footed garlands, sequential converging hop turns, etc. I came away a believer. I skied much better with a lower, more athletic stance.