I am wondering if, perhaps, the spawn rate of bandits during the day and undead during the night, could perhaps be turned down a tad?
I understand if you and those in your testing group are capable of handling/prefer large groups of enemies assailing you at all times, but not everyone is fond constantly of wading through small armies of enemies.
Perhaps a config option to customize that to a user's preference?
Thank you for taking the time to read this.

Regards,
~ The Wind-Lord, Bufavolous

Unfortunately that is not currently possible for Minecraft 1.12