Zane, I think you are overthinking things just a bit? Once you get a bareshaft, a fletched arrow with field point, and a fletched arrow with a broadhead all hitting the same spot (and that spot is the one you are aiming at), you are there!
If you have an arrow that is "there" and you change the point weight just a bit, say 25gr, not much is going to happen. it it was "there" to start with, it would be a little stiff or a little weak (depending on which way you went with the change), but still perform fine.
Obviously, we want to closest to "there" that we can get.
Now go kill something and post up a story and pics!!!
Bisch