Favorite Tail?

[Dawgvet]

Ok, now I've got your attention, I was wondering what you thought was the best tailing material for heavily hackled Wullf-style flies? I tied up some Thunderheads for mountain streams but the tails seem to be sinking when they land more times than not. I used about 5-7 moose mane fibers on the #14s. Any input appreciated.
Jed Green