Got to admit, that bit about the relationship between Hunger and vulnerability is news to me. I might be inclined to ignore it when it becomes inconvenient (like when it ruins a dramatic, suspensful, or funny scene).
I don't think that True Faith is the Catch of House Skavis. Isn't it True Hope?
It's mentioned explicitly in the books , in Turn Coat, in the scene after the incident at Club Zero
; I can't get you chapter and verse right now (one of my players has my copy), but I distinctly remember it as an explanation on why Thomas was never burned by touching his brother.
And my bad on the True Faith; none of the WCV Houses have True Faith as a vulnerability.