So, I then disabled the MSFS HDR and enabled the VESA 400 and went for a fly on the landing challenge.
Windows HDR on - MSFS HDR on - Monitor HDR normal
.
Windows HDR on - MSFS HDR off - Monitor HDR normal
Windows HDR on - MSFS HDR off - monitor HDR Vesa 400 on
I am preffering MSFS HDR off… you guys have a point!!
Its as though the MSFS HDR just is a white mask, with out the monitor functionality, but the monitor does it better without MSFS on.