I have been playing a Pathfinder, Caustic Arrow Ballista poison build for a bit now and I am liking it a lot. It was not my league starter, but I am thinking of starting it next league as my only character. ( i normally roll a bunch and get bored of it in T16s.) All the gear is super cheap and available.

My question is around elevating it more than it is. I think that it is pretty much at a plateau as the upgrades are super expensive, but I was hoping there was some weird interaction that I was missing that would up the DPS. Survivability is great, so no problems there. I imported my character as it is and cleaned up the links and this is the PoB: https://pastebin.com/viZidV4K

I plan on getting the frenzy forbidden jewels, probably getting +1 arrow on my quiver to make the scourge arrow easier to land and that is about it. Currently flasks are 100% uptime, the onslaught drops for a few seconds every once and a while but it is okay. I use scourge arrow with infusing channeling for the damage boost and survivabilty. Withering step is just for moving faster and applying a stack of wither to start a boss. I have molten shell on left click and use vaal molten pretty liberally. The malevolence aura has a 20s duration and is pretty easy to keep up. Basic play style is to drop totems, charge scourge arrow for the buff when doing bosses, otherwise I don't really bother, drop totems and run around. It clears pretty quick and bosses melt pretty good. The character is pretty cheap, I am buying 6 linked dendrobates and double corrupting them right now.

With the frenzy generation and extra arrow making scourge land all 5 pods, it will be around 11M dps during focus window, around 6M dps outside of focus.

Am I missing something that will take this much higher? With expensive gear I can get to like 14M in PoB, but it is not worth the cost as it is clearing everything just fine right now. I am just wondering if I am missing some odd item affix, unique, or link tech that will boost it higher.