I did a mod for the tilt mechanism! Set it to 1.5. Fells like a new chair.
So, I have little experience with 3d modeling, and this mod could be WAY better design (i can sketch in pen and paper how to improve it, but i cannot model it, so if someone whats to improve it feel free)
It's a simple 1 min print, 1 gram of filament (i use 100% infill and I advise you to do the same)
It's a simple print but not so easy to put on the chair... I try to explain in with these pictures. However if you own a 3D printer you probably have a maker mentality, you can figure it out, just start disassembling the base, taking out the screws that you see until you can see the tilt mechanism, after that if should be pretty obvious.
This makes it so the position 2 does not go so much back, you can think of it like a in between 1 and 2 position, but keep in mind this does not make the chair have 5 settings, it's still the same 4, but the second position is higher up.
model here: https://makerworld.com/pt/models/2818777-libernovo-omni-back-tilt-mod-adjustment-1-5?from=search
(check the all the images in the link)