Generally speaking, slight imperfections in the vanes will not cause that much of a flight problem. Even with small waves in the vanes or slight wrinkles, the arrow should still fly true.I do think however you should try to keep your vanes/feathers in the best possible shape you can.

As far as using the correct arrows, I think this is a must. Not only thecorrect length but more importantly the correct weight, size and spine. Once you have properly matched arrows to the bow and weightyou are shooting, you can eliminate itas a possible cause and therefore make it easier to pinpoint your shooting problems (if any)

Good Luck