PoE Elementalist, Cold, Duration builds without Mageblood with custom stat filters

Looking to improve my cold dot in terms of dps. I have a budget of around 10 div, any tips would be appreciated! pob:

Leveling Tips Act 1 - 5 Rush Elemental Overload on skill tree, if needed pick up Health Mana nodes on right side of witch starter area, i go for life on top right first then branch left to templar area. Buy Minion damage / Infernal Legion support in Act1. Socket in Summon Skitterbots in Act 2. Also optional to level Spiritual Aid during leveling to boost both your and skitter DPS then respec out of it later. On lvl 28 equip 4L Vortex + Deadly Ailments + Cold to Fire + Ignite Prolif

I want to preface this by saying I am not good at making builds and I haven't played for a few months. It's certainly not "finished", and who knows how easy/hard uniques are going to be to get. Just wanted to put it out there so someone could fix it haha. Brief overview: Elementalist Frostblink Ignite Staff Block New Bronn's Lithe Blackflame seemed neat assuming it works like I think it does and makes the ignite skip enemy ES EDIT: Thanks for the feedback. Still WIP. V2

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