nice deck. a couple more equipment might not be bad though. a card:Runechanter's Pike is always fun to put on the guy you're going to be attacking with. another card that could be good here is Infiltration Lens . that will at least make it so they can't just keep chump-blocking your exalted attacker. or if they do, at least you get cards.
I don't have too much of a problem with chump blocking. It happens, but I picked a good set of creatures to push through with- Tormented Soul is unblockable, Vampire Nighthawk has deathtouch + flying, Skirsdag High Priest can generate 5/5 demon fliers (doesn't happen too often though), and Nefarox, Overlord of Grixis has flying + sacrfice a creature. And Knight of Infamy has protection against white which is obviously good against white decks.
cool stuff! loving the simplicity!
maybe try Mark of the Vampire so you can benefit from lifelink from non-nighthawk creatures.