By default mouse acceleration is on and its awful. This will fix it:

Further to this it would help to disable mouse acceleration in windows under Mouse Properties: Pointer Options> Enhanced pointer precision - turn this off.

Having mouse acceleration off gives you true muscle memory reflexes and will improve your experience.

go to "C:\Users\*yourusername*\AppData\Local\EvoGame\Saved\Config\WindowsNoEditor"
find the input.ini
add this to it:
[/script/engine.inputsettings]
bEnableMouseSmoothing=False

If you don't disable smoothing you would need to use a polling rate of 250 Hz or lower otherwise the game is very weird feel.