TBH, you really need to adjust the configs, some of the abilities are just "OP" or "unfair"
Here's what I use in my Omega Dawn pack+server.
B:"MM_1UP enabled"=true
B:"MM_Alchemist enabled"=true
B:"MM_Berserk enabled"=true
B:"MM_Blastoff enabled"=false
B:"MM_Bulwark enabled"=true
B:"MM_Cloaking enabled"=true
B:"MM_Darkness enabled"=true
B:"MM_Ender enabled"=true
B:"MM_Exhaust enabled"=true
B:"MM_Fiery enabled"=true
B:"MM_Ghastly enabled"=true
B:"MM_Gravity enabled"=true
B:"MM_Lifesteal enabled"=true
B:"MM_Ninja enabled"=false
B:"MM_Poisonous enabled"=true
B:"MM_Quicksand enabled"=true
B:"MM_Regen enabled"=true
B:"MM_Rust enabled"=true
B:"MM_Sapper enabled"=false
B:"MM_Sprint enabled"=true
B:"MM_Sticky enabled"=false
B:"MM_Storm enabled"=false
B:"MM_Vengeance enabled"=true
B:"MM_Weakness enabled"=true
B:"MM_Webber enabled"=true
B:"MM_Wither enabled"=true
We have Zombie Awareness too, so have to adjust the Infernal chances:
# One in THIS many Mobs will become atleast rare
I:eliteRarity=50
# One in THIS many already ultra Mobs will become infernal
I:infernoRarity=50
# One in THIS many already rare Mobs will become atleast ultra
I:ultraRarity=50
This gives added challenge, without being overwhelming.