[quote=@Keksalot]
Also, things being said and written, some questions:
1) Vampires do not have innate superpowers, but is my Art of Flesh still viable? Can vampires, for example, practice and cast magical sorcery fuelled and powered by their magical blood?
2) Сan vampires with time improve their physical capabilities or are they forever frozen in the state they were when they were turned?
[/quote]

1. Wow.. after reading that more in depth... it's hard to say no, so, here's the thing, and my final decision. The vampires can have supernatural powers, but they must have weaknesses and limitations. 

2. They are frozen in the state of age, but they can say, 'work out' like a mortal and improve things such as strength to a certain degree.