Should definitely be prioritizing Dex over vit, the increase from the vit on the class stats is negligible from a damage taken perspective so it's better to just add it to the Dex. From a realistic perspective you shouldn't be getting hit with anything that isn't raid wide or mandatory damage. The current gear has enough vit to meet the threshold for this and allow for some mistakes.

As far as secondary stats, I haven't seen the stat weight updates since the expansion but typically after meeting acc cap I prioritize det > crit > SS. 1 Dex was worth about 3 det before expansion.