I'm not on your server, and I'm an assassin, but I just beat him this morning at level 40. Maybe you can get an idea from my fight...
I used Talos as my companion. CTRL+1 for him to attack, and he freezes him with Carbonite.
Then I, Crushing Darkness>Force Lighting>Shock>Electrocute>Force Lightning. I jolted his Electric Storm move, and basically stayed mobile and hit him with the above moves as the cooldown expired. Expert Medpacked (Talos can't keep up really)...by this time he was at 30%, so Assassinate, Electrocute, Force Lightning and I think I was able to throw another Assassinate in there FTW. The first fight I lost and used my Channel Force, so it wasn't up for the second fight.
It was pretty manageable the second fight. Just stay away from that Electric Storm move, or stun it. I hope this helps, if I was on your server I would give you a hand.