It sounds entirely straightforward to do a randomized, blinded test of freshly sharpened vs unsharpened skis. (Okay, the skier can feel the edge or look closely, but a cooperative skier could just not do that for the purpose of the experiment.)
Youth racers tend to ski with one set of edges on the inside for training, and the other edges inside for racing (under the theory that the inside edges take more of a beating. Who knows if that is accurate). If you ever see youth racers on slalom skis (which are chiral, since they have tips that deflect ski gates), you’ll often notice that the skis are on the “wrong” foot.
Also, that's awesome that you competed WC moguls. I probably saw you compete depending on when you were active, and we almost definitely know some of the same people.