At the moment I seem to be on the wrong side of variance when playing KK which is probably good news since this should mean that the good times are about to come!
I can sympathise completely, I have an awfull record with KK which has recently got worse. I have won 2 out of the last 10 with KK and I never slow play them. But like you I await the variance pendulum to swing the other way.
I thought it had last week when during a £500 live tournament I pushed all in on a flop of 3,4,7 and was snapped by 5,6 for the straight. I got runner runner 7's for the house.
At last I won with KK............ had them twice since and lost both.
They still look good pre flop though.