If the system was running flawless before installing OMV and does not after I suggest to blame them 😄.
What armbian-config more or less does only is downloading the omv install script and execute it.
https://github.com/armbian/config/blob/eebfc58c140a34d6e28db5ecbc5faba6b8432ca4/debian-software#L559 ff.
Slightly off-topic but interesting. Quite a while ago I tested a 16:10 monitor with 1920x1200 resolution on the Station P1 I could not get to work with other kernels than legacy 4.4.y. Which branch did you build against? current or edge?
IIRC there is some sort of Asus related package within Debian/Ubuntu repository. Maybe that will deal with your issue.
Regarding forums I do not see any further content from you. New users are limited in posting for a short period of time. This measure is unfortunately necessary in order to fight spam.