Gamepad settings - adjusted speed sensitivity/linearity to 70%, reduce twitch at high speed 2

First back-up the file gamepad.json stored in your Steam folder at this location ..\Steam\SteamApps\common\Le Mans Ultimate\UserData\player.

Replace it by the file available here (it will use my remap though, so be mindful about that if you care about your mappings) or alternatively look for "options":{ section in your gamepad.json and edit the values you wish.

Enjoy !