Driving the shovels via cuff pressure works ok with cambered skis, but will get you in trouble on early rise or rockered skis since there isnt really anything to push on. Ive found bending the ski by pressuring the soles of your boot works better for both types of skis, and you dont run the risk of collapsing your boot.
Won't work with the new 30/35 meter GS skis, which all have early rise, tip rocker. You have to pressure the tips, as the tips are the only place on those skis that initiate the turn. From the mid ski to the tail, sidecut is minimal. You need to do a forward and down the hill move to get them to work. Lose constant forward cuff pressure, and they just go straight. We are having big problems when we get advanced U16s or U19s on those skis. They never learned to ski that way, even though they should have. If a boot collapses when pressuring it in a forward, down the hill move, it is way too soft for the individual.