[2019] Help with some Mods

Hey ppl,

currently we're trying out some Mods on Singleplayer and a Server.

I'm using 3 Core modes like Annunaki, ARK Eternal and PrimalFear.

We changed the Overrideoffcialdifficutly to 20, but it changes back to 5. The Annunaki Mobs are at Level 600 but the ARK Eternal and PrimalFear mobs arent. They're stuck at lvl 150.
Difficultyoffset is at 1.0, this was suggested by the Mods.

What am I doing wrong? And how can I change it?