I played this deck last night at FNM and it destroyed my very good vampire deck. Once you exile or oblivion ring away all the creatures and get Ajani out there, it is game over. Jace eventually exiled my library.
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My deck is very, very similar to yours. I am torn between using disfigure or urge to feed. I like the -3/-3 urge to feed does and the +1/+1 kicker it does to a vamp, but the BB mana cost worries me. That extra 1 mana that needs to be left untapped at all times could be a game breaker. I am seeing a ton of red deck wins out there and the B for -2/-2 in disfigure would be plenty to get rid of their 6/1 creatures. The same goes for Highborn and Hexmage. Hexmage works great against RDW and plainswalkers, and at competitive tourneys every decks is either RDW or has a plainswalker. I do love the life gain of highborn while it saps the opponents. Mind sludge is a Jund killer and is a must in a vamp deck, so I like that. I have never thought of grim discovery before. That would be nice to bring back a fetch land. But nocturnus is usually exiled so discovery wouldn't be able to bring that back. Don't listen to the haters out there about the land fetch if you see it. It is a great move for deck thinning and card advantage. I'd add another sign in blood too. Highborn, nighthawk, and especially tendrils will gain back plenty of life you lose from fetching lands.