We have so far had clear statistics that the hands re-raising KK and calling the AI are mostly Aces. I think if you get re-raised you should gather more information by re-reraising him. I will make a raise big enough not to give any other pairs implied odds plus if my re-raise makes him go AI I am pretty sure I am beat and I will fold. He might also call with worse cards, say JJ QQ AK. These guys just arent making any plays with worse card and not that many of them are playing sneaky by just calling with AA. I have found this raising war before the flop to be a +++EV play.