I am also a PIMAX 8KX user and see the background flashing.
Stopping the use of high load TAA and reducing the quality of DLSS and clouds has mostly eliminated the problem, but the quality is worse than before SU10.
The name plate flickering in the clouds is very annoying.
The problem becomes more pronounced with thick clouds and very distant views.
Lack of cloud z-depth? I feel such a discomfort.
The problem occurs only in VR, normal displays are fine.
