Personally i detune the shit out of my skis. I basically round them underfoot, dull them at the contact points, and leave them sharp infront of and behind the boot.
detuning contact points makes the ski less catchy on hard-packed and allows you to butter without fearing for your life.
buy a diamond file or something and bring it with you riding (gummi stones - used for racers and are pretty useless). you will figure out how u want your skis detuned based on your riding style and where u usually ride