There are three main steps to putting the SMACK DOWN on elk, or deer for that matter. Choosing a broadhead can help a little. First tune your bow. Second choose the right spine weight arrow for your poundage and draw length, match the right tip weight to your arrow, it's called front of center ballancing. Third tune your broadheads to your arrows by spin testing, make sure there is no wobble. Then your broadheads should fly the same as field tips. My advice on tips is stay away from mechanicals! Go with a strong fixed blade, Muzzy's, Innerloc's, Thunderheads's etc.
Good Luck DBLung