yeah i like calling ATs always unless you think you can induce something based on history/game flow. This new 4bet size does seem a lot more standard. I think that floating it is all right sometimes but I'm going to play the hand you flop pretty cautiously (I would shove if he bet but when he checks I think you need to check back). As played I think you should call because if youre not good you still usually have about 26% equity.