If you are sat on weight of a broadhead and really want to have it working at it's best. Shoot it over a chronograph turn each limb down a 1/4 of a turn and see if you gained speed if so another 1/4 off a turn until it level out are in some cases starts getting slower. Find the top speed of the arrow your shooting and that's what we call the sweat spot for that arrow with that weight of tip. I sat all my 3D bows up that way to get the best performance out of a arrow and the bow.