I'm not a dev, so I can't do anything about that ingame, but you could try to fix your controllers deadzones either through your OS, or through Steam, if you use that.
For Steam:
Right-click game in Steam Library > Properties > Controller
And there you can find a link to the "Controller configurator" and all other settings that would just apply to this game.
For Windows:
There are many steps and it would apply to all games, but here's a pretty detailed guide that works for Win8/10/11