That kind of makes sense. In my opinion vampires should definitely be more difficult but yet way more rewarding. There is another option though, you can leave life leech on these guys (you may just lower the %), remove blink and nine life, introduce elder vampires to the game (with better equipment and armor and with blink) and add vampire patriarchs with unique equipment, blink and nine lives (the same approach used in other species). So basically there will be to branches of undead, ghouls, vampires, elder vampires, patriarchs and zombies, skeletons, skeleton warriors, necromancers.
