Don't think anyone answered this, so I thought I'd get back to ya!
I don't think Wolf Ring or poise in general will help at all if you're seriously planning to abuse the Red Tearstone buff. Seeing as you need a low percentage of your health for it to activate, most enemies (let alone other players) will one-shot you, making poise redundant.
FaP ring is what the guy uses, so guess you can't go wrong there. You could always try a Pyro version of "hyper mode" and use Bellowing Dragoncrest (which I believe boosts Pyro as well as Sorceries). That would mean you could concentrate on DEX (for casting speed) and END, without worrying about INT/FAI.
I haven't watched all of that run yet, but so far it's amazing. I think the only time he levels VIT is when he needs to take a more powerful hit (to activate Red Tearstone and not die) xD
But yeah, just go crazy and get back to us with your results!