Improving TS Deadeye damage

Hey everyone! I've been enjoying Tornado Shot deadeye as a casual second build this league (first was EoW Inquis miner which was fun but slow) and would like to push it a bit further.

I've followed Fuzzy Duckzy's excellent guides to get it set up on the ~5 divine budget setup on fractured bases with essence rolls. It is a smooth and fun enough mapper at T16 even for this cheap, especially compared to a miner. Then, when I was about to put the char down for the league, I yolo rolled a Headhunter from Gwennen which safe to say makes me want to push it further to get the full experience out of zooming and juicing.

I've got about 20-25 divines liquid in my stash and would like to improve the damage, as it can feel lacking in some corrupted T16s depending on the mods. However, I don't know how to best go about doing that as viable upgrades seem to have ballooned up in price. (Namely, Omniscience and related gear, which is how Fuzzy Duckzy himself improved the build past this point).

I really like the idea of actually using the HH instead of selling it. Are there any obvious low-hanging fruits I can grasp to pump up the damage I'm dealing with only about 20-25 divines? My primary concern is that it's late league and everything is crazy expensive, which makes me think that if I'm going to upgrade a gear piece it's likely just going to have to be self-crafted, which I am extremely unfamiliar with beyond the basic essence rolling and going from there.

Any tips are appreciated. And if the answer is 'everything is just expensive and I need to farm some $', that works too I ... just wanted to check. Thanks!

PoB: https://pastebin.com/BjtDNdUk