IMO, You shouldn't be raising too BIG against other players in certain situation. For example, on a 6 players table, the Blind is 1/2 , and you raise 12 dollars with that AA, most of the player will fold their hands, and you will end up collecting blinds. YOU DID NOT MAKE ANY MONEY, and your BIG HAND IS WASTED. sure you can say,, uhh if i dont raise it up, i am gonna get rivered and ETC. the key is to isolate your OPP, not to scare them all away. raise a little, enough to keep 1 or 2 players in the game, and see what's going on the flop. AND DO FOLD UR POCKET ACES when its not looking good. For example, you are playing a full table of players that will fold their hands frequently, when they go ALL IN, you should consider what they have, most of the times, they will have one pair beaten, unless ur playing against an idiot. well, you can not predict how fishs going to play.

and i want to add up something, when you are calling some people's all - in with big pocket pairs after flop, there are some information you should know about your opp. and he may be bluffing, its okay. you will get him when u have a solid hand, but if you lose your money, it will be hard to get it back. so save ur money, wait for a better chance, and nail him.

so what raise would you recommend with AA or KK
4BB+1BB (per Limp) formula?

i usually do that, to mask monster hands in the range of other strong to medium hands, and try to only get people that are already dominated pre flop to play me

I think 4-5xBB with big hand is OK, but if you're shortstack I should go allin