Higher end skiers doing J turns and uphill arcs is a very easy drill Steve. A more advanced version of the uphill arc is to follow your track switch after the hill makes you stop going uphill. If that's not difficult enough do it again on one ski. Inside and outside ski. When you're finished with that do some carved reaching slalom turns. Make the turn radius smaller than the side cut. If you use tip pressure that will either limit how tight you can carve, or at some point the tails wash since you are so far forward.
Keep off the tips and you can get a tighter turn though. It sounds counter intuitive but I spent last spring playing with this. If you have a chance come out and play with Tony Sears and you will see this at an incredibly advanced level. I want to ski those turns like he does.
So what movements is that skier making when doing these drills that allows the skis to slice? I am not quizzing for a specific answer, but rather curious about how high-level skiers and coaches describe those movements. They are certainly different from the movements I learned in my earlier years of skiing that tend to result in my skis chattering or skittering sideways on hardpack like a car on a washboard road! Those movements are more "pushing" on the middle of the ski with the skis on a high edge angle, expecting them to somehow grab and begin to slice.
But, it's not enough! There's more to it. What's that "more" from your perspective? I'm really eager to read how you all perceive this, since I am becoming more and more aware of how differently different people experience skiing, and how challenging it is to describe movements in a way that resonate with many people and cause an "ah-ha". Of course, this is why it's more effective to work on helping people experience the sensations and movements on-snow, but even there I think it helps when we create descriptive distinctions to assist comprehension and ownership, don't you?