i would like you to try something i did several years ago .
you will need to get one each of as many arrows of different spine weights as possible in aluminum and carbon. cut them to the proper Leigh .even get some that you think cant possibly work 1916 through 2512
you will find that with a field point they all will fly just about the same .
now put on the broad head,that you intend to use ,spin to check for wobble, you have to be sure that the head is on straight. you will need to shoot at least 30yds to get a proper test .and the one that hits were the feild point hits is the one you should use .
i went in to this test using 2117 i now use 27" 1916 with vanes from a 70lb bow i would of never dreamed that 1916 would work so well .