I normally shoot 29" arrows, but WalMart is having a clearance on all of their arrows. My local store has a bunch of 31" arrows and I'm wondering if the extra 2" would make that much of a difference?

The $5 per arrow for Carbon Express Hunter Lite's is very tempting, even though they are longer than they need to be for me. I don't have anything to cut them with and I don't want to bother with it. I'm just wondering if it really matters that I'll be shooting arrows that are 2" longer than they need to be?