You're using a spec that doesn't give you much in the way of defense *or* the ability to maledict him. That's bad news. You can lag him (theoretically), but then it's just a melee vs. melee contest, and it's unlikely you're going to permalag him long enough to kill him. Esp. if he's doing maledict moves between your lag moves.
Also looks like he was pretty dam reducted. Your wraths did lower-case damage.
Again, in theory, things should get better for you when you get a 2nd spec, since then you can use your whip/flails for more utility. Like, entwine, then switch to your damage or maledicting spec. Stuff like that.
Wonder if hitroll would help w/ lash landing? Just an idea.