Help please! my brother's keeper: cleanse the benticoff tv

I'm stuck at this big fight just after the twisted corridor.

My load out is:

Pierce lv2 + (+26% & +32% dmg while aiming)

Spin lv1 +37% rate of fire boost

Personal mods: +33% health +50% shield boost +31% health

Nonetheless I'm getting my ass handed to me repeatedly. This is the first major roadblock that I've hit so far.

Please advise