We also have this from a conversation Harry had with Thomas in Blood Rites:
"The last time you were with anyone, it was with Susan. You love each other. Her touch, her love is still upon you, and still protecting you."
"If that's true, then why I am still adjusting my pants every time Lara walks by?"
Thomas shrugged. "You're human. She's lovely and you haven't gotten any in a while. But trust me, Harry. None of the White Court could wholly control or feed from you now."
In this instance, Thomas could be an unreliable narrator. Then again, maybe true love inspires hope and faith to the degree that Harry could at that time and now, resist both Skavis and Malvora, though perhaps not to the same degree as House Raith. Also, maybe Harry’s touch wouldn’t burn them. Maybe it would burn them as well, but not as bad as Wamp who was a member of House Raith. I’m just guessing here, but I’m trying to apply some logic to this as well.
If you want to bring up what happened at the end of the duel in the Raith Deeps, you have to factor in that Vito’s ability to crush Harry and company with despair was turbocharged by an Outsider. Perhaps one of the Walkers. In fact, I would bet it was one of the Walkers, but that is a different discussion. In any case, Vito was given far more power to throw around than a normal White Court Vampire.