Sadly we can't. The way the servers work is they generate a universe specific to the size of the player count that entered. Everything is calculated according to that. We have been discussing maybe allowing a little overlap, but in any case the problem would still arise that there is a finite size for the generation, and after those slots are filled there isn't anything we can do to enter people.
just get 1370 people to join the current game open. It'll spawn right away then.