I'm a lvl 55 Sorcerer, and this one IS harder than the other boss fights; then again, it's the end of Chapter 4 - you should expect that.
It took me about 10 tries to get beat this.
I have been a Lightning Sorcerer since starting, and from a PvE standpoint, a pretty good one at that. But I couldn't get my head around this one.
I tried with Khem Val, I tried with Xalek... 3 or 4 times, both well geared with 156 (and some 162)... and I could not do this.
So I switched to Corruption, thinking I'd heal my way through it. What happened this time, was that I actually died QUICKER as a healer, than as Lightning. Did this about 3-4 times, with Khem and Xalek.
AND... I did absolutely pathetic damage on the boss, in this spec. This instance has you running all over the place... and THAT'S when it clicked:
I was going to have to DoT this mofo, and keep myself alive!
So I respecced Madness, pulled out a sorely undergeared Talos Dreilik (on passive), and just popped DoTs on the Archon whenever I could... while Talos healed me, and I Lightning Storm'd the droids.
I was able to also get one of the isotope generators down, when a droid dropped the quest item. That seemed to seriously slow down the dps the Archon did.
In the end, it's true what was said: keep moving, and beat the droids as quickly as you can. But in the meantime, the full Madness spec did wonders DoT'g the Archon.
It's not easy, but through trial and error of whatever spec and companion combinations you have, you will eventually beat him.