Cleared it last night, pretty easy all things considered some things of note:
1. Bulwark Burst - you can run abit away from melee range and not get hit by this, i did this as the tank.
2. Bulwark Smash - someone other than the tank needs to interrupt this, it seems to reset or lower tank threat if it goes off.
3. There's a middle ground where you won't be hit by burst, ranged and healers can stand by the generators to avoid dmg
Don't worry about the droids, let them repair the generators if they want, just have someone there ready to click on them again if need be.