I have the same problem with rtx3090. I came from oculus quest 2 after I uninstalled the oculus I make it to work. I had my settings in 100% on ss and I had decent FPS like in oculus with better visuals, but after I change my high settings on dcs from high to low and high again, I start to had shutters and I lower to 50% on steamvr. Now I have 45-65 FPS but I can’t get the reprojection to work even if I force to enable it on steamvr. I see on fpsvr is going from 43,45,60.