Ran it yesterday. First 2 times we didnt have a real plan and were messing around. Third time he enraged. 4th we destroyed him fast.
At the end we ran with 3 uptop. 1 Healer, 1 Bounty Hunter, 1 Sniper (Me). But, I would break off of dps after 1 or 2 rotations and start clicking as early has possible.
Rotated from right to mid spot. After the 1 proximity droid spawn we were able to near constantly have the shields down. Don't wait for shields to come up before you start positioning or clicking especially if you are only clicking with 2.