Center mounting is only desirable in all park, and even then not always. If you looking to be that park specific, the Foil is probably not the best ski. It will perform pretty well in the park mounted normally I'm guessing, so stick with the recomended line or whereever they are normally mounted and get the ski you pay/paid for.
we mounted a friends skis like 2 cm forward of recommended, but I wouldn't go any farther forward than that, the foil is an all mountain twin, not a park twin. Sure they'll work, but honestly they'll ski better back from center.