I don't shoot feathers through mine but It is tuned properly I have had no problems with vane damage. I assume that with feathers if its tuned properly they will be fine but they will probably wear out before vanes. The only time you will get damage with a WB is if its not tuned properly.
I have just started shooting feathers through a WB. So far I like the way it shoots, but it does seem to be wearing out the feathers pretty fast. I talked to a couple other guys at Gander Mountian and they thought I was crazy for shooting WB with feathers, I am glad to hear that there are others out there that are doing this.
AAE 4" fletch or 2" Blazers will shoot fine out of the Bisquit and they won't wrinkle or be damaged in any way as far as vanes go. Other vanes seem to wrinkle in my experience.