I gave up on tweaking and tinkering with Kodi - bought a Panasonic 4K Ultra HD Blu Ray Player with HDR10+ Dolby Vision DP-UB450GN-K from Amazon with 2 HDMI out's - one port for audio only, the other for video. Easy peasy
The Optiplex micro relegate to streaming MiniDLNA library duties only.
On a positive note, LE is the best choice for a home brew Docker host server as it allows root login out of the box (which other distro's can not). Thank you for the great support helping me out with my Kodi experiments, much appreciated!