Make an appointment with Scott "Dude" Dudevoir at the Cole Sport located on the plaza at Park City Mtn Resort. Call them up and ask for "Dude", thats what everyone there calls him, they'll know exactly what you mean. (435)649-4800. He's the shop manager and main bootfitter. Don't just show up, make an appointment, its worth it to see him when he has time to look at your problems alone.
IMO, this guy is by far the best bootfitter in Utah and I think I've been to just about all of them. Last week he spent 3.5 hours with me on alignment, boot mods, footbeds, and analyzing my feet. He practically remolded my boots. He can do Conform'able or Superfeet footbeds, and they carry all the big brands of boots (Nordica, Lange, Salomon, Dalbello, Rossi, Tecnica).
The difference in my boots after a few days of skiing is huge, I can't recommend this guy highly enough.