Good news, i got the hdr isf calibration for the set. B_rad4 over at avs was kind enough to share his settings with me a couple days ago. The main difference between these correct hdr settings vs the modification i was using is color gamut. The hdr mode is displaying in bt 2020 vs rec 709 sdr was probably calibrated for, the colors certainly look more vivid in hdr now. Here are the settings:
Now he did mention that the hdr calibration isn't perfectly dialed in as the sdr settings but that is understandable considering hdr calibration is still in its infancy and a major pain. The hdr looks absolutely amazing now with the correct color saturation. Recently i have been using movie mode for both sdr/hdr gaming, i don't really notice the input lag that much and it allows me to enable blur reduction to reduce the motion blur in scenes.
Here are my hdr settings using the above as the base for color and white balance:
The modification made the blacks look better on my set, also the overall picture looks brighter now which really helps movie mode not look as dim. If you want some reference material to test the new settings here are a couple of examples:
SDR:
Video 1
Video 2 Death Stranding 4k teaser (loaded with micro detail).
HDR:
Video
I might post my modified movie sdr settings later today.
Hey what a cool coincidence you are also on neogaf. Thanks for the settings again, they look spectacular!