OLEDS suffer metameric failure.
That will be wrong, not the Eizo.
Also, you CANNOT look at white and judge its accuracy.
And a vectorscope has NOTHING to do with calibration.
You must select the correct probe setting, and rely on the reported values.
However, your 10a result is just wrong - as you say, just look at the RGB Balance result.
It is totally inaccurate.
Something in your workflow was done incorrectly.
Ah gotcha. My license has expired so I won't be able to make the new changes currently.
Was the 12a/12b more in line?
The difference there was I adjusted the color temperature via the monitor itself first.
Then do a volumetric profile >>colorspace conversion>>then profiled.