Is there a way you could add a command or config option to reduce the crafting dead zombie spawning? I have a couple other mods that add overworld mobs and it feels like the massive amounts of cd zombies spawning in make it so these mods can't spawn in there stuff.

This is what datapacks are for.

Where would one find said datapack?

You can make one with this: https://misode.github.io/

I'm terribly sorry, but I can't even pretend to know how to use that. :/