Final update.
After jumping over to Stable, starting up DCS and then reinstalling Beta.
I was unable to find the server [83.255.209.224:10326] on the list. So i decided to test out the above.
First i wanna note, that i was able to see more server then previously (+2 more 4YA servers, but not Full On War server)
After renaming the folder to DCS.openbeta_backup i booted up DCS, here i was missing the two new 4YA servers, but i tried to connect to [83.255.209.224:10326] which i could. But it was still not showing on the list.
Then after shutting down DCS, going back and renaming the DCS backup folder back to just DCS.
Started up DCS and on the MP list, the +2 4YA server where back. Tried to connect to [83.255.209.224:10326] and it was a success.
Still unable to see it on the server, but i think something got bumped back into place.
Still wondering what might be the cause for this, if DCS does not like how Steam handles games being moved to other storages? or smoething in that line.