2080ti assetto corsa issues

Hi, Got a 2080 ti and and coming from a 1080 ti ... Did someone got less fps from a 2080 ti than a 1080 ti whit Assetto Corsa? Playing whit Oculus rift Got a 8700k whit 16gb of ram.. All other games have a fps gain.. In AC i got solid fps drop... Like 43-45 fps whit SS at 1.4... whit GBW...