Well I finally had a teamviewer session with Doman. As best as I could tell from watching, he ran some diagnostic routines but did not “calibrate” anything or make adjustments. He pretty much just read and analyzed my FW, apparently doing some static checks. I say static because the HMD sat stationary on a stool the whole time. No problems were detected. I was hoping/expecting there would be some motion tests and measurements. After he was done with his checkout he asked me if I wanted to update the firmware to the latest. I said why not. Might as well try something. As expected it made no difference.
I must say though that it is nice to have Pimax tech support be so responsive. Though it is in their interest as much as the customer’s to explore possible anomalies so they can improve production quality.
Edit: And for completeness I went ahead reconnected my Vive and must correct myself and say that it is not “rock solid”. That would be near impossible. My mental comparison of the two would be that the Pimax does have a bit more lag. (Maybe due to the type of panels being used?) And maybe that “bit” added to what I saw in the Vive is enough to make the lag jump out at me. So I guess I’ll accept that my HMD is not defective and just get used to the lag that I’m experiencing as a new norm.