John Juracek is co-owner of Blue Ribbon Flies in West Yellowstone with Craig Mathews. I stopped in there a number of times this summer while fishing in the area. One afternoon, the shop was pretty much empty and I talked John into tying me a fly. He asked what fly I wanted to see, I said: "tie whatever you like". He tied an X Caddis.
The tip is this (am sure many already do this): Trim the butt ends of the deer hair/elk hair before tying it in. Just trim the butt ends at your measure point.
It seems to provide a neater head.
PS this fly is not the best, but put it here to show the head.