Vanilla enemies are super strong. Also,changes are turned off by default and stack size big, add technology.
''Strongly recommended to use with other mods''

biter
small > Hp:1.5K, range:1, damage:70, resistances:Various 2 20%
medium > Hp:7.5K, range:1, damage:150, resistances:Various 4 40%
big > Hp:15K, range:1, damage:300, resistances:Various 6 60%
behemoth > Hp:20K, range:1 damage:450, resistances:Various 10 90%

spitter
small > Hp:1K, range:10, damage:100, resistances:Various 2 20%
medium > Hp:5K, range:12, damage:150, resistances:Various 4 40%
big > Hp:10K, range:14, damage:200, resistances:Various 6 60%
behemoth > Hp:20K, range:16, damage:250, resistances:Various 10 90%

worm
small > Hp:10K, damage:50, resistances:Various 2 20%
medium > Hp:15K, damage:100, resistances:Various 4 40%
big > Hp:20K, damage:150, resistances:Various 6 60%
behemoth > Hp:20K, damage:200, resistances:Various 10 90%

spawner
biter > Hp:35K, resistances:Various 2 20%
spitter > Hp:35K, resistances:Various 2 20%