Hebiki, the carpet version will work well on a high bite track. It was designed not to be so aggressive on a high traction surface, aka, carpet. But well prepped outdoor tracks may benifit from less downforce as well.......Especially if you run stock or 19t modified, since downforce equals drag.
You only want more downforce if your car is loose with less, basically, the lowest downforce that your car handles well with.
Even in F1 they take wing out to increase speed in the straights!.....