Faceoffs are hard at first if you are not use to them at all. It is all timing and sooner or later you'll get the timing down and be able to win most of your draws.
As far as the powerplay, the system I told you of working it low and then getting it back to the point is what you would want to do. The thing with NHL games is that, majority of the time you get guys who don't play proper and when they get the puck on a PK they skate it up the ice, rather then dumping it. I really wish EA would fix that so that on a power play, if the other team gets the puck they pressure him instead of skating away.
If I get some time, I'll make some videos if you'd like and show you some of the things I've been saying.