The rotation is looking good, I'm glad to see the DoTs there. I'd have to really "see" you to see if maybe you're combos are slow, missing a cooldown, stuff like that. But all that aside, here's the thing though: if your ilvl is roughly 50-55 it's not uncommon for the kills to be slow, so, that's not really a problem. Not to mention those golems have decent HP. You're not supposed to be flooring them in a flash, nor should you be expected to, and the other DPS really should've helped out. But once you get overgeared you'll definitely be able to down those adds quickly. So no worries, you'll get it.
