My preferred HDR settings is to use Rtings settings in both HDR and SDR
Movie Picture Mode: Backlight: 50 Brightness: 0 or 1 Contrast 43 Color: 25 Sharpness: 0 Contrast Enhancer: MAX/high Local Dimming: Low Digital Clean View: Auto (clears out some banding issues) Auto Motion Plus Settings: 1, keeps movies more judderfree HDR +: off Color temp: Warm 2
Use: DCI-P3 for Color Gamut and calibrate using Rtings above settings for white balance and colorspace calibration in - DCI-P3, as Netflix and other streaming providers use this.