And isn't it enough?
I certainly don't mean to be offensive, but it seems to me that a natural bias is to just give the "true diedne" a lot of uber powers just because we know next to nothing about them. You don't have to try making them that uber.
Compare it to "the magic of flambeau", or "the magic of tremere"... They don't get that much house-specific extra v/f. Mostly, only the MC houses do.