Well you are partially right^, I do suck at rails, but I also find it easier to slide rails on normal skis than I did with my Pow Air Grinds. And when I said that they couldnt hold an edge, I was comparing them to a normal pair of skis. But I wouldnt ever go and get a pair of those again, just because I seem to slide rails better with normal skis, and plus I like to have an edge on my ski where you need it most. But I do agree that they should be about 85mm under foot and then they would be perfect for sliding rails.
I have a theory that all retards have one long tendon that goes from wrist to wrist, so therefore that is why they always are screwin around with one wrist up, and the other one down.