If not using it now, I recommend using DDU (in safe mode) to make sure you get rid of all the previous driver data. https://www.wagnardsoft.com/
I also had horrific stutter. Mainly in the station\market screen. To cure it, I rolled the gforce driver back using DDU, disabled game mode in windows 10 and reconfigured graphic settings again. All good.
Flashing imagery was also present in project cars. I believe it was cured by a new nvidia driver.