i have been using kern aim on apex and all the cods and my experience for it is wonderful i like it and its smooth and im playing ranked for cod this season and i hit iridescent almost every time.
here are my settings:
FOV: 40
SMOOTH: 9-9
DEADZONE: 2.4
DYNAMIC FOV: 140
RECOIL COMPENSATION: 45
AIMBONE: NEAREST
AIM PREFERENCE: 2D
AIM KEY 1: LMOUSE
AIM KEY 2: MOUSE1