Hi,
Any special motive for installing Hassio on Docker instead of HA (or directly HA into venv on Debian and skipping Docker)? With Debian VM & Docker & Hassio there are 3 VMs running one inside the other (or as di Caprio would say a dream in a dream in a dream 
)
I know Hassio is more user friendly but venv installation should be more flexible.
Running two separate VMs with Ubuntu Server (HA and Plex) on a less powerful NUC than yours still doesn’t get processor load above 0.5