What's your line-up?
I mostly used a Force Psyker (Hurlshot) for shielding, a Hacker (Labadal) for healing and then a Cyberninja (Shadysands) and my own Void Psyker for the damage.
Basically I took out their shields, Hurlshot gave us shields, Shady cut them into ribbons, and Labadal made sure we staid on our feet.