Thats nearly exact the same I do. My Sim is running very stable 30FPS and with enabled frame generation I got 60 FPS visible on my monitor. I recommend to make a nvidea panel profile for the SIm and cap the FPS at 60, and then VSYNC ON (either with or without adaptiv). The GPU then limits the Sim to 30 FPS exactly and provides the other 30 FPS via Frame Generation. Cheers