I realize this isn't news to some people, but for those who don't already know (and i know many don't because i'm constantly telling my raid groups about this), running the lamp section with icebreaker is a HUGE help. You can turn around and no scope/quick scope into the crowd of thrall and it will destroy most if not all of them, not to mention you get the +2 Agility. Give it a try.
Edit:
MIDA sounds like another great weapon to use for this. Unfortunately though, i do not have that gun. So i can't try it out. :(
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Any +2 Agility weapon is great for that, so long as you also have your subclass perks set up that you have about 50% Agility. The MIDA is fantastic for that section as well because it seems to have a hidden Agility bonus along with the hidden Stagger Rounds, but you'll outpace the rest of your group using it so don't rush too far ahead and leave everyone else with x10 Darkness as you activate all the lamps ahead of them.