Alright, kiddos! It'll be 2x2 for the nether and 4x4 for the end. Easy peasy.
(Now's your chance to mine and stockpile all that soon-to-be-trimmed moon rock and hell stone!)
I'm thinking tonight I'll trim all the things to get our final 1.13 backups size under control. Then maybe tomorrow evening I'll stop the server, trim the regions once more, upgrade to 1.14, run the server command to "optimize" the regions per the format changes, and start it all back up with the new seed.
Aye?
Or should we wait any longer?