Greetings, welcome to the forums!
How is your experience with the W1080ST so far? It looks good on paper but I want some seat time with one. Hoping to pick up one in April for my b-day.
If you can align a column of control points exactly on the locations where that bend occurs you can tweak it some, but it's not ideal. It's an issue specific to the camera code in the racing sim. They've got it setup for triple flat panel screen. This would be something we'd have to ask them to add a curved screen mode for. Does it have the option for single screen mode but at the triplescreen resolution? DCS world also has this issue. In DCS world I set for single screen and adjust FOV manually in the config file. Not sure if you have that amount of flexibility with Assetto Corsa. I meant to pick it up on the holiday Steam sale but it never got above 25% off I think. All the games I have are out of personal pocket, so I have to be frugal with my testing library and typically buy on sale. The game is on my wish list though.
-Brad