I seriously need help! (LVL 59 Scrub)

Hi,

I'm currently in act 2, Merciless. But I have a big problem, my dps is 290 :/
With lightning fork it's 450, and dual strike is 500dps. How do some of you guys get 3k dps around my level, I don't understand what I'm doing wrong.

These Are my stats: 80% allres, ~1.9k hp, 3k unbuffed armor (7k'ish with molten shell and aura)

At the moment, molten shield with ~2200dmg on explosion is like my main attack, because it takes so much time killing anything with ls/dualstrike.

Any tips on what I should do?

Hard to comment without knowing your build and items...