To set the sensitivity in the config file, first set both Mouse Sensitivity and ADS Mouse Sensitivity to 0 in-game, then exit.
Open the file [GAME FOLDER]\RaidGame\Saved\SaveGames\ControlSettings.sav in a Hex editor, like Hex Editor Neo which is free.
Look for the four bytes "0ad7233c" following "Sensitivity01 FloatProperty" and "Sensitivity02 FloatProperty", these are hipfire and ADS respectively (the screenshots show 0.01 for in-game, this should be 0):
Change these two to the calculated values for hipfire and ADS:
Save the file and close it, then start the game and it should be perfectly matched.