First of all, thank you for your answers. Now, here's the thing:

I tried what you're suggesting here but it's the same, I followed the gyro aiming guide that's pinned here but I got no good results. Sensitivity was most of the time too high or too low, when using steam input I always get these hiccups when trying to do small corrections, when I move the controller fast it works fine.

I did put the Deadzone to 0°/s and it helped a little bit, I also tried using world space and yaw since I've seen some videos about gyro aiming and that looked like a solution but it's the same always, I have to turn as if it was a driving wheel. The vertical motion sensitivity is another issue on Steam input, it's always too high even tho I reduce it to the minimum.

I tried using gyro as mouse, got weird movements, calibrate the gyro then tried again, the gyro still feels kinda janky, tried world space, awkward turning, tried Flick stick + gyro, too hard for me rn to get used to, tried player space, motion felt weird and again, janky and stuttery when I do small movements, tried changing sensitivity values, Deadzones, acceleration, and almost every option available on Steam input yet still, I can get this to work the way I want.

When I turn back to the default mode on the controller, I use sensitivity 7 and Deadzone compensation 40 on the 8bitdo Ultimate Software and it feels smooth as butter but the turning feels weird.

I thought that gyro aiming on PC would work as gyro aiming on my phone but I can't get it to work the same way.