If you are shooting a drop a way, put some spin on those suckers! Especially if you plan on using fixed blades for hunting. You really don't need much though. A little offset should suffice in most cases.

The only reason I can see shooting striaght vanes is beccause of rest clearance issues with skinny carbon arrows, or shooting long distances where the arrow has more time to stabilize. Lot's of long distance shooters use small straight vanes because they have less drag. But they spend a lot of time tuning to make up for it.

Not that you can't shoot straight, lots of people hunt that way and do very well. You just have to be a little more diligent setting up your bow is all.

Good luck,
Paul