these settings improved my aim alot.
the idea is, lower vertical sensitivity & higher horizontal sensitivity.
set input MouseX Axis aMouseX Speed=8
set input MouseY Axis aMouseY Speed=4
fov 80
setsensitivity 0.10
set shockbeam drawscale 0.2
set shockbeam lifespan 0.15
I turn left & right mostly with buttons Q & E,
this helps me use extremely low sensitivity.
to go back to old settings:
set input MouseX Axis aMouseX Speed=6
set input MouseY Axis aMouseY Speed=6
fov 90
setsensitivity yours
try it out if you're bored.
good lucks