I asked ChatGPT about it and it gave me some pretty good tweak. Not that snappy of course, just follow your target more easily. Copy these lines in your "fallout4custom.ini" if using ModOrganizer 2 then edit it in your specific-path profile and find the "fallout4custom.ini".
[Combat]
fAutoAimMaxDegrees=10.0
fAutoAimMaxDegrees3rdPerson=10.0
fAutoAimMaxRange=3000.0
fAutoAimMaxRange3rdPerson=3000.0
fAutoAimStrength=1
fAutoAimStrength3rdPerson=1
For my personal settings I only change these two lines:
fAutoAimStrength=100.0
fAutoAimStrength3rdPerson=100.0
And ramp up the sensitivity aim in the in-game settings menu to max, leave the rest of the lines just like above.