I can't get a server config file to generate only the client config

It is there I just thought it would be in .minecraft/config

Server config is stored in a server/save specific "serverconfig" directory. So basically in .minecraft/saves/<level_name>/serverconfig for Singleplayer Instances and in <server_folder>/world/serverconfig for Server Instances.

If config file is not present there:

1. What MC version and Addon version are you running?
2. Is this singleplayer world or multiplayer server (this should not matter really)?
3. Are you using other mods (other than Tconstruct/Mantle of course). Can you reproduse this issue using minimal set of mods?

Common config is stored in .minecraft/config or <server_folder>/config ;)