Fob Vanes have been around for nearly 10 years now so if they were as good as all the claims then everyone would be using them. They were specifically designed to stabalize broadheads, supposedly quicker and more efficiently. Having never used them I can't comment. This doesn't mean they cannot be used on the field course and you see them from time to time but none of the top archers use them for target and perhaps this is because they couldn't shoot groups without vane damage.
As far as I am aware they have neither been approved or dis-approved for use in ABA shoots.
However if I had someone in my group tearing the vanes off my arrows I would getting that person to shoot after the rest of the group had shot, scored, and removed their arrows.
I would suggest the FOBS be left to use where they were intended and that is with a broadhead attached to the arrow.
Still a Scout.
I'm not trying to be difficult. It just comes naturally.