The biggest problem with the PP is still going to be Doughty, he's just not good on the PP, it's the elephant in the room again.
He never reads the play right to sneak down from the point, when he gets it at the point he either shoots it into shin pads or he Stoll's it off the glass. There are certainly other issues with the PP, but if Doughty's PP skills matched the rest of his game I doubt we are nearly this bad on the PP.
The Doughty that the Kings need on the PP is the Devils goal in the Final, the Rangers goal in the Final, or that one against the Coyotes where he walked the line a bit and got a wrister through. Instead of that, we get him wanting to be MacInnis with a booming stationary shot from the point that hurts the goalie and rips a hole in the net. Unless the coaches are the ones that keep telling him to just stand there and shoot. He needs to be a roamer though. Constantly moving around on the PP. Up, down, left, right, B, A, B, A, start. As long as he's at the right point, slowly shooting slappers, he'll keep getting them blocked save for the one or two that manage to get through every year.
It would also help everything if Kopitar either didn't take, or got better at taking, the opening PP faceoff. It really seems to set the tone for the entire 2 minutes. If that first faceoff is lost, it's almost a guarantee that they will do nothing on that man advantage. There ends up being one or two offsides. They waste at least a minute having to go back and get the puck multiple times. Those stupid drop passes, which isn't just a Kings thing. There has to be some metric that shows that actually works, since a lot of teams do it.