Jason, with these scales it is not uncommon to have variances from one scale to the next, what is important is that the one scale you have is consistent. Your readings are odd numbers..
It does sound like the brass may be what is bringing the arrow short of 430 grains, not much else could be affecting 30 grains of missing weight.
It doesn't matter, as long as they are all the same you are fine, actually better than fine, you have gained a bit of speed and managed to keep the weight forward. The only catch is to remember that and be prepared for a shorter flight when you make new arrows. I would prefer 80 grain brass to 110, it is a fine transition between very heavy and not heavy enough.
Let us know what you find out, and keep your thumb off the scale!