I've noticed a couple issues when using this mod that hopefully you can shed some light on:

1. Other hostile mobs tend to not spawn anymore
   • They do, but much MUCH more rarely. For instance, only during a blood moon when the spawn limits are multiplied
2. Zombies spawn in the nether and the end
   • It seems nether & end mobs spawning is reduced as the spawn limits are saturated with zombies?
   • In the end eventually the entire place is filled with zombies, no more endermen spawn

This creates problems with seeking out mobs necessary for certain resource,s like spiders, creepers, and especially endermen. Endermen are essentially non-existant.

In the nether this causes problems with finding nether mobs, such as wither skeletons.

My questions would be:

1. How do I preserve normal hostile mob distributions, just with extra zombies
2. How do I prevent zombies from spawning in the nether & end?

I'm on 1.12