Board Thread:General Mod Discussion/@comment-36683454-20190325065125/@comment-26172435-20190401192239

Likely those other mods create biomes in the Overworld dimension whereas the LOTRmod creates them in its own dimension DIM100. You will have to find a world generation mod that can take that into account.

Sorry, but I won't take a look into that BiomeTweaker option, nor into ClimateControl. As it seems to be important to you, you would be the one to put some further effort in it. We do generally not volunteer to test out mods or server/client configurations that are hardly ever used in the community. There may be exceptions ofc, but not this day.