This is great information,,, I am thinking of this as the "New Stack". For the last 4-5 years i have been stubbornly focused on my stacked position with good progress in my body position but not equivalent progress in slalom scores.
A big "light bulb " moment occurred early this spring when snow skiing. I was skiing our favorite run on the mountain, scary steep " double black diamond", one where if you fall your sliding to the bottom of the run. My feeling when i am snow skiing steep terrain is that my head and shoulders are leading me down the hill, as if i am pitching myself down the mountain,, otherwise your in the back seat and on the tails. Two days later I read GUT skiing with efficiency and " Wholly S---" I realized I had developed a solid stack BUT it was a "STACK vs BOAT" and not a "STACK vs SKI". The Fall Line comparison speaks to me,, Thank you ADAMS.