I use 4 look and 3 ADS sensitivity with small deadzone and classic response curve. Before I think I was playing at 5 look 4 ADS with deadzone off. With deadzone off my aim was super twitchy at close range. I would really struggle to hit a strafing target at close range because I would always overcorrect. Turning on deadzone solved that and thats when my damage went up an avg of 100 per game or so. I became much more consistent at close range.
I also bought a thumbstick extension to make the look stick half an inch longer or so to make it easier to aim.
These are the extensions I bought.