In my case, I have used both trueflight and natural turkey feathers. I apply it to the feather, slowly with out streatching and I do use the back edge of a knife to make sure of the contact with the shaft, so I know it isn't a clamp setting issue. I use casket lacquer as my sealing coat, some times three dips but I always steel wool the gloss off.
I think, in my case,it could be not glueing the front and rear of the arrow after I am finished, not sure.
I would much rather use tape, no waiting, I just need to figure out the mystery.
Thanks for the input.
Pip