I just bought a dozen of the A/C/C arrows. I am going to take them to the shop tomorrow to get them cut. Let's say that I need to cut them 6". Should I get 3" cut from each side? Why or why not?

You dont have too but thats what I do just to make sure I get the straighest section of shaft.

It makes sense to me too. I've also found that even after doing this, one end of the arrow might be straighter than the other and I use the straightest side for my insert end.

You shouldn't have to with ACC's but other carbons it's almost automatic. But it won't hgurt anything to do so except for one thing. Your nock inserts are already installed on ACC's, right? You'll be cutting them off and will have to install new ones. Can you get them as precise as the factory?

They are not installed yet.

Zak, put them on a arrow tester--Pine Ridge Archery makes a pretty simple tester and it works really well.
From what you see, then you make that call.
I also like to square the surface of my cuts and I use my G5, ASD to do this.
Cutting the arrow to remove any wobble is the best thing to do, but if the cut isn't straight/square you can be defeating the entire purpose.

with Easton ACC or any other aluminum arrow cutting both ends is not nessessiary. Cutting both ends of an arrow shaft generally applies to carbon only shafts to be able to get it as strait as possible at both ends

you cannot get an acc or aluminum arrow any straiter than it already is.