A weapon that lacks elemental damage. Right now the weapon you are using kinda cancels out your triumvirate. Also, look for some lacuni's with crit chance. They cost an insane amount but you will gain crit chance there, attack speed, and run speed.
Are you using Meteor as a way to get CM to remove CD from Archon? With Pinpoint, it looks like you're running 48% CC so Living Lightning can work as your signature spell instead of Electrocute (you have no APoC to sustain Meteor or WW spam). In Meteor's place, throw in Sparkflint familiar to further increase your DPS.
Archon isn't designed for high MPs to begin with. You might want to sub Energy Armor for Storm Armor-Scramble to improve low MP farming speed. Once you tack on more EHP and perhaps more movement speed (Inna's Temperance or Lacuni Prowlers), you can try out higher MPs with hybrid CM stunlock-Archon builds.