Towers and Dungeons mod zombies excessive spawning

Tower and Dungeons mod’s mutant zombies have insane spawn rates. They will spawn in your base with plenty of lighting and even in places that will make them suffocate. I can clear out and torch a space, do something different for 5 minutes and have like 10 of them waiting for me. There is no way to build a base or structure without them being everywhere as there is no way to spawn-proof an area. I assume this affects any version or platform that the mod is available on, and their other mobs don’t seem to have the same issue. Thank you!