I think the key is to not make it predictable.
In the playoffs and to start the season our power play sucked, it was predictable, every team studied it. Pass the puck to matthews and he shoots... I would say he took 50% or more of all the slap shots on the net.
The Boston announcers were awed by Rielly's shot, they said, they could not believe that he did not have more goals with a shot like that. We need defensemen that can shoot the puck like that, Rielly obviously being one of them. Matthews will still get his looks, but lets not make a point of looking for him the way we always seem to do.
I am not surprised that sans AM we scored 3 PP goals, suddenly, we were not so predictable... they were never sure who was going to let it rip. Also the size and physicality of Knies at the net was a great advantage.
EDIT: I am not saying that AM should not shoot, if he doesn't that hurts us also. We just need a more balanced attack from everyone, AM faking a shot here and there and then passing would not be such a bad idea now and again... might get a few guys to drop to the ice to block.