Do this one.
That's it. That's the post.
Okay, fine.. Any Kinetic pulse rifle. Le Monarque. A good arc rocket launcher. That's genuinely all you need. I know Le Monarque can be a task if you don't already have it but you need to just get it. Obviously "unstoppable pulse" and "overload bow" are what you want for modifiers.
This is the lost sector to grind. You will finish, on average, in about five and a half minutes and that's if you're being cautious and slow. If you're amazingly awesomely elite and everyone's a n00b compared to you... Firstly, dear lord just shut up. Secondly, you'll finish faster.
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Are you talking the 1350 or the 1320? I got to the First Overload after expending pretty much all my ammo killing the Abominations and then the SOB wouldn't stun properly with La Monarque. He'd "stun" but continuously fired grenades while stunned.