As far as the broadhead only is concerned the only thing that needs to happen is it must have straight blades and be perfectly center to the arrow.

Now when you take into account the entire tuning process you have properly spined arrows, Center shot, nock high or low, type of rest, spring tension on the rest, fletching contact, vane or feather, length of fletching, right or left helical/ offset or striaght fletch, cam lean, diameter of the arrow, FOC, length of arrow, speed of arrow, tiller, string strech, peep movement, type of nocking system, human influences, ...................... Any one else care to add something?

And no two bows or shooters will ever be exactly the same.