I would recomment dropping the 3x Blood Reckoning . It just isn't really worth it for a 4cmc. You should consider adding in Shadow Alley Denizen instead, as it is a 1-drop, and all of the creatures except Phantom General have black in the identity, it will help to push more damage through. It also drops the curve significantly, and allows for possible damage on turn 2. Pushing damage at your opponent - even just a little here or there - puts them on the defensive, which is what you want from an aggro deck.

I would also recommend pulling out the Grisly Spectacle s. Since you aren't winning through mill, and you don't have any effects that "steal" cards from graveyards, it's nothing more than a WAY overpriced kill spell in this deck. Two cards you should consider - Ultimate Price and Renounce the Guilds . Since you don't have as many multicolored permanents in your deck as most other decks in the current meta will, I think having Renounce the Guilds could do well for you. Though keep in mind - if you cast it with Sorin, Lord of Innistrad on the field you will have to sacrifice him unless you have something else.

Otherwise, feel free to take a peek at my own vampire tribal deck: Vivid Vampires. I know it's modern, but it might give you a few ideas nevertheless. :) Good luck with the deckbuilding/FNMs!