i normally run with 20 land it would give you more room for more assassins like unliving psychopath or maybe Orzhov Euthanist and still has a good amount of mana. maybe some equipment because you ether need better defense or faster damage your monster destruction is ok but you need more then that i usto run with a deck like that but it didnt work that well till i put more damage effects in. maybe bloodchief ascension then everything you kill they would take dam. im not around my cards right now but i can look through them later i know there is some i have that would help your deck a lot and send you the card names later.
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awesome deck i currently have a black/blue-vampire/zombie deck because i dont have enough vampire to make a pure vampire >.< still pretty descent though.