That’s odd. My understanding is that the Pimax driver is supposed to override it now. What driver version are you using? (Is it current?)
I had version 132 or 144 when I did those observations. It wasn’t right that I could raise the steams VR SS more and more without affecting my score on the benchmark. Right after I did this, my 1080 TI and my Ryzen 5 3600 could not maintain 90 FPS anymore if I over exagerate with steam SS.