That's about the only place where I could see that it would make any difference at all since the arrow doesn't begin to spin until a few yards out. If you think about it the vanes would really need to be slightly offset from your blades for them to be traveling through the same plane of air. That would also depend on if you had straight vanes, offset vanes or helical and how much offset or helical you have because your arrow would spin faster or slower depending on your vanes.