1-2mm is nothing but really you should beable to dial them in so there is no run out.

The other day i hit a curb avoiding a truck that went right on red infront of me. Killed my rear rim on the wheels i just finished building. It bent the side walls down on each side and tacoed the rim maybe 10mm out of round. I got it home and got out my hammer anvil and a file. I went to work and now the rim is nice and true. Luckly i don't use rim brakes on my commuter or i would be looking for a new rim.

good luck and just sick with getting it true.