Are you slow playing KK because it is such a good hand that you want other people to stick around? Then stop! KK has better chance of winning whne you are aggressive. Raise and Reraise no matter what preflop.

Always bet/raise an Ace high flop with three or less opponents. If opponents get aggressive back to you, then you can fold. But raising preflop then shutting down to an ace screams that you don't have one, and good and bad players will stab at you. You wont know where you stand. If the board is worse, such as all one suit or consecutive, then you ahouls still bet, but again, if someone gets aggressive you may not havet he best hand anymore.

Give us more info so we can see how you are playing. If you are losing with KK and it is not simple statistical variance, then it should be easy for one of these posters to figure it out. How are you doing with AA, QQ?