excellent topic and discussion. my .02; in my experience @ the microstakes level FR is that if i do not raise 3-4x BB PF with KK , it seems villian will call with Ace rag and catch an Ace on the flop. what i am trying to accomplish with a 3-4x raise is for them to fold (and limpers) so to isolate the ones without an Ace like suited connectors. not saying this is the correct way to do it but seems to work for me.