I've tried lining my vanes and broadheads up too, and don't notice a difference. I think with my helical fletching...every facet of the broadhead will see left/right/up/down so the overall effect should be minimal. If you look at most professional guide sites for elk equipment, they want their clients to have cut on contacts (penetration is better and blood trails are bigger with an entry and exit hole). I use a 125 grain Muzzy Phantom it has a longer blade which penetrates better, but because of the larger blade surface is also more susceptible to poor form which demonstrates how important it is to practice with good form and broadheads.