My first time posting on these threads ...so I haven't read anything -yet- so be kind if I'm repeating something.
I haven't finished reading your original post yet, but my initial thoughts as I go...
I'm up to volkihar. So far
I really like everything you've put down. It makes total sense lore-wise and the ranks would make playing a vampire really interesting. I especially like how you regress if you slack on feeding.
On the Volkihar:I would say make Snow Veil a normal cast and not a Once-Per-Day. Alter the stats of the power as needed, but as a player I think having it as either a normally cast spell or even a toggle power would give me that extra feeling that I'm
becoming a force to be reckoned with.
Also...Master Volkihar, I'd suggest negating the sun damage completely for all your master vamp levels, and keeping the current H / M / S ding you take. I know, it sounds horrible...a vampire in the sun that's not taking constant damage...but I personally think Beth was on to something interesting with their debuff system. For me, it made venturing out in the day light more risky and exciting. ...and that's all the defense I'll say on that
Those are my two septims so far sir!