[Chaos]

Uh.

Chaos. I'm not sure if you've actually went grinding yet

Did you even read what I was saying? I would not have said something if I didn't already try grinding.

-I have went solo grinding in a regular dungeon, and only suffered when I acted like an idiot. (see: running into a pack of spatials, which I proceeded to murder the next turn anyways)
-I have went solo in group matches at the Arena, and while it wasn't a complete walk in the park, I found that they are entirely doable.
-I have went solo against a Dungeon Boss +50% my level that didn't have a bare-bones/poor skill set, and secured a win.

I'd also like to mention that you pretty much just ran into the big new weakness of Vampires; their ability to sustain is crippled without taking a hit to their SC buffs, or a risky offense that can be easily outdamaged. In PvP, it might only be an issue against certain opponents, but it's one hell of a weakness if your plan is to go all Rambo through a dungeon, or in an event that uses more-than-sporadic fights.