I wonder the same thing but have come to the conclusion (after seeing beautifully tied knots in WAYWRN, some the same maker and width of ties that I own) that my FIH technique sucks. Where to start the knot, how close to the neck am I when I first cross over, how much longer the wide side is compared to the short when I start it....all kinds of variables. Not that I'm trying to achieve a perfect knot, either. I like a "natural" looking knot.
A FIH is a simple knot but I think i need to practice and pay more attention. Usually I'm rushing out the door and if it looks about the right length, I go w/ it. Lately I've been going w/ a bow! So much easier.