Just spit balling, but one way to reward very populated servers, is base the number of wild surges on players online at that time…
1-10 3 wild surges
11-20 5 wild surges
21-30 8 wild surges
31-40 10 wild surges
This would punish the servers who claim to wipe servers by not giving them much to do outside of running around.
Also the chances when summoning your own surge of getting t4’s should be tied to that number.
This should be adjustable as well for server owners.