PoE Vaal Breach, Cold, Duration builds

My goal is to clear mobs fast so this is an elementalist spamming Vortex on left click which ignites thanks to Shaper Of Flames. Then dual Obliteration wands deal chaos damage which ignites more thanks to Shaper Of Flames. I haven't put much emphasis on the Vortex DPS, the damage dealer are the Obliteration explosions, hopefully. Budget is not bad either, none of these item cost even 100c , most cost much less. The cluster jewel is the only one which might run 1ex. The 6th link is Combustion but that requires a 6L brass drome which is a bit more expensive so I