We defeated him using the above method. We started by line of sight pulling him to the building somewhat in the middle of the room. It is between you and him when you enter. This allowed our CC classes to have time to choose the robots they were going to CC.
The other thing of note is that all of the attacks done by the boss have a "cone" area of effect. Meaning dps classes need to either stay behind or to the sides of the boss to avoid taking damage.

KR-82 is a bonus boss in the Flashpoint "Kaon Under Siege". He spawns after activating the 6 beacons.
This is, how we defeated him on hard mode:
Fight starts with tank&spank. Not a big deal. Party may be grappled from time to time. At about 60% KR-82 starts charging up a spell named "Energy Surge" which ends up in a decent PBAOE-Damage. Try to sty away from that. After that PBAOE KR-82 will cast an energy shield on himself and summon 3 Droids. That droids may look tiny, but the do pretty awesome damage. We controlled two of them and focussed them one by one.The boss will be inactive at first, but will join into fight again after about 30 seconds. Tank should hold both, the boss and the droid, that is under attack.
KR-82 will summon another 3 droids at about 30% after casting another "Energy Surge" and PBAOE. Repeat the controll & focus on droids and finish the boss afterwards.
Dropped Columni Headgear Token and a 110% Mount.