What weapons are you using? In the current version of the mod, you can get the special drops when killing the monsters with regular weapons, or use vanilla hunting weapons for a slightly increased drop chance. Avikan hunting weapons currently revert the drop pool to a generic hunting drop pool, so you won't get any special drops with Avikan hunting spears and the like. This is an issue I intend to fix in the next version of the mod, though!

I'm also still working on ways to fix FU compatibility in regard to biome spawn rates and such. I intend to add more biomes and such later on, so this is definitely an issue that needs to be fixed!

Oh, okay then! I was using every possible Avikan hunting weapon (bone knives, bone spears, bone bows, harpoon guns), which made the most sense for me. Thank you a lot!