Take a look at this build? (Not quite zerker)
instead of 20 in acrobatics i would go 20 in trickery and pick side strikes for a little more damage, also thrill of crime to give you a fury boon since you aren’t using furious retal in crit strikes(also gives u 3 additional initiative, kinda good since you have 0 initiative regen whatsoever except roll for initiative). hidden killer is argueable, sine your crit chance is 55% i’d use executioner.
edit: also getting close to your opponent is gonna be tough since u only have steal and no other shadowstep at all. (they could basically kite you out)
edit2: your bane are going to be conditions btw :S
A mix of Soldiers and Berserkers gear instead of Valkyrie offers more defense and more DPS. Math can be found by clicking thief in my sig and reading.