I've been distributing my points at about a 1:2 Str:Vit ratio. I focus on gear stats of Vit first, followed by str/parry/acc at roughly equal values. Str typically comes with Vit so that's no issue, and parry is a no-brainer. I like accuracy because missing attacks as a tank sucks hard, since that's 99% of our threat gain (the other 1% being Flash).