Ok, first things first: Dynamic Range. @brian Thanks, that was new for me. SDR settings are absolutly fine. There is no need for recording HDR for me (anymore). I never thought of turning HDR off, because it sounded like a cool feature. But no use in my workflow.
I experimented a bit to compare SDR/HDR w/ and w/o BT.709 conversion. Like you said, normal SDR without color-conversion works best. So for me no more conversion because of the colors.
