I think I have some pretty good stuff, but I'm at 76K-99K damage, and I don't feel like I have enough damage (or tankability) in teganze, or am I just lacking the skill to play it? I've tried to farm it and died like 20-30 times, these poison absorbers are a real pain in the arse. Any certain direction of upgrades I should go for? Is the Ix shield a good idea for teganze?
First of all, ignore that your character sheet says for poison damage, you can easily make those numbers say hundreds of thousands if not millions. It does not accurately reflect what damage you are doing.
Your gear looks good except I would swap out your shield and eventually rings. I'd swap out to the TU Bladed Shield here, the reanimates will help block some projectiles for you. The rings are giving you more damage over time from the +poison duration, but not more damage per second. For more up front damage, you should be looking for rares with +1 skill, +poison spell damage, and -enemy poison resistance at the minimum.
The poison absorb mobs aren't going to generally die in one hit, so for efficiency sake I would run past them and focus on all the other mobs. However, with your more duration focused build, you might be able to one hit them, it may just take the entire duration of your poison which looks to be between 3-4 seconds.
Teganze is more about getting into a rhythm from dodging projectiles, sustaining from your LaK from your knife, and popping a potion whenever you get hit with poison. Low hp pool on ssin can be challenging in Teganze since you aren't really able to mitigate damage there so we focus more on mobility than defensive stats. If you watch the video in my showcase, I rarely get hit. It looks like I somehow forgot to record a second run on the new one I was leveling, but the strategy is the same. My new one had worse gear so it was just a bit slower.
I'm also not sure where your life currently sits since it's not accurate on NotArmory or what you have in your sockets. You can work on jewel crafting aiming for +life on your spell damage crafts unless you want to try to roll MF ones first.
You also seem to be missing some charms that you can get at 120. I would go back and make sure you have all of those, especially the stat ones. +stats helps you a lot since you almost double dip into energy since it gives +str as well.
Signets of Learning will help you a lot too, but you will get those as you farm, no real need or reason to go back and power farm them.
Here is the one in the showcase videos for comparison (I haven't played it in ~2? months): https://tsw.vn.cz/acc/char.php?name=Sam