Agreed, the gray scale looks fine but i'm still trying a couple more runs. I'm not sure if the spike went away because I increased the delay on my Murideo from 0.5 to 0.75 or if something changed. Later today i'll post more when i'm done. I've been sending Tyler all my files for him to look at. Although the LUT still has some issues I was surprised the yellow spike disappeared since no matter what I tired before, minus changing the delay on the Murideo, I could never get a CM LUT without it.John you showing us a Grayscale in a 3D LUT look at the file description LG_GS this is NOT a volumetric Profile and it has also issues.
What I eliminated was:
The low light handler on the Klein On or Off had no difference, but I'm calibrating this set to match my Sony in my bright living room at 180 nits.
Setting the Klein to 3 samples Avg or 5 samples Avg had no difference
Setting the Murideo to RGB Limited vs YcbCr had no difference.
(I knew all this but verified it, again)
The thought was that maybe the Klein was misreading so I had to try a couple of tests. Also even when I calibrated at 100nits, same yellow spike on many 2019 LG OLEDs and the CX where I tested.