I got massively frustrated with this mission (as my guildies will probably agree), so much so that I wandered off and did the rest of the Alderaan missions, gained a level and came back for another go and a different approach, cobbled together from advice given on the forum. I had been using Kaliyo as a tank, which simply wasn't working as DJ seemed to ignore the tank and come after me. So I switched to Vector for his melee damage dealing As Vector was supplying the majority of dps, I just used interrupts as much as possible, popped Shattershot when needed and used instant dps abilities. I stayed away from snipe and ambush due to not being able to interrupt while they were casting. Very annoying fight.