I have a new idea that I will try to exploit tomorrow, not sure yet if it will work but I will try my best.
Basically, I will try to move only some of the maps into a new sub-server, but without having that sub-server active at all.
This would mean that you will teleport to Icarus, for example, just like you would teleport to crywolf (to another sub-server), and the map will be held only there (in sub-server).
This would keep everything (almost) as it is while splitting the load into multiple sub-servers.
Will let you know further details.