Thank you very much for your feedback ! … didn’t know that the HDR could be turned on or off (its only level 10 though), I will have to try to undo the Sharpen+ filter on the GeForce system, switch HDMI (HDMI driver may not be the newest one) and DisplayPort cables, check for specific monitor driver … 
Do you know to what degree my “old” AOC 27 inch 1080 monitor “taxes” the RTX 2070 Super (if being only used for internet stuff) ? … also, can I “undock” the in cabin view like on FSX ? (to put on the old monitor) …