Vextexfux Fork of ArmouredBiters https://mods.factorio.com/mod/ArmouredBiters
I have modified the settings to accomodate more options for % of Health and Resistance.
I have also added a formula for the % resistance of the biter to never go beyond 99% of resistance when you tweak the resistance of the biter.
The Formula is math.floor(-100/math.pow(1.25,oldresistance/20)+100)
So an old 1% is 1%, 10% is 10%, 20% is 20%, 50% is 42%, 100% is 67%, 125 is 75% etc