disable the gamepad acceleration by adding the following to your fallout.ini (documents/my games/fallout4)  under [Controls]


CHECK DOWNLOAD SECTION FOR PROPER VALUES, NEXUS IS SCRAMBLING THESE ONES

https://github.com/Nexus-Mods/web-issues/issues/1591

fGamepadLookMaxRotationSpring=20.0000
fGamepadLookMultExponent=0.0000
fGamepadLookAccelPitchMult=1.0000
fGamepadLookAccelYawMult=1.0000
fGamepadLookAccelSec=1.0000