Wacker,

Q1. Are microfibbets too small to use on size 10 dryflies?
> No. You have to use 2 or 3 on each side though.
Q2. Can you tie an effective 'Footprint dun' using microfibbets as the outriggers?
> Don't know.

Q3. What is your preferred Tailing material on Size 10 dries?
> Spade hackle(the real thing), including Coq de Leon, is the tailing material I prefer on all dry flies excluding Wulffs and a few customized flies.

Allan