I didn't know about the first wave of droids using a debuff.
I finally killed this guy last night in a group. We wiped quite a few times. In the end our strategy was just hit the boss with everything we had and ignore everything else. We wiped on that one too but not after I managed to get the killing blow on the boss. An expensive run but good fun all the same.
Next time I'll try this though, it sounds a lot more pragmatic.