Works perfectly with the Valve Index. Even in 144 fps with res 200%. Haven't tried the Rift CV1.
New patch arrived yesterday for EverSlaught, maybe it helps?
Valve Index & Oculus Rift CV1, Asus Strix OC RTX™ 3090, i9-10900K (5.3Ghz), 32GB 3200MHz, 8TB
"Ask not what VR can do for you, but what you can do for VR"