Comparing the perf benchmark results to my 1080 Ti, I would say they seem alright. What however seems to be not alright is the render target resolution recommended by the driver.
This is huge. I do not know if it is only 8K thing or new PiTool thing since I do not have either, but I would ask @PimaxVR why (at assumingly PiTool set to 1.0) the headset needs so much of supersampling. Is it Large FOV?