We have trimmed the **** vane on a number of bows that have rail interferance and had not noticable diferance in arrow flight. The Blazers are pretty flexable and you can cut off a bit and it does not seem to hurt. Myself I would say cut first before you have to go and re-fletch, however, if you want to change the fletch most archery stores including me can set you up with the Duravanes if you prefer.
Wyvern