Join Date: Mar 2005
Location: Fort Myers, FL.
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After trying a LOT of different settings and ideas, I realized the only changes I could make without affecting the SDR calibration was the basic controls (contrast, backlight, and color) and a setting in the phone app for gamma (I can select a gamma setting of 1.8, 2.0, 2.2, or 2.4), even though as I understand it, that shouldn't matter with HDR, but changing the gamma preset drastically changed the EOTF luminance levels.
I have my SDR calibration gamma setting at 2.4 and the HDR gamma setting at 2.2.
I can't change the 11 point grayscale or CMS settings as you surmised because that would change the HDR as well.
I'm guessing this might be the best I can do. I'm just getting hung up on the HDR graphs because they look so far off from the reference lines.