Well yo can play with module.ini.
It's in every module folder.
I always change those numbers, so it's harder to survive on battlefield.
Also changing horse charge damage can improve footmen vs cavalry combat (cavalry will have less chance to win battle)
Try to change these numbers:
armor_soak_factor_against_cut = 0.65
armor_soak_factor_against_pierce = 0.35
armor_soak_factor_against_blunt = 0.3
armor_reduction_factor_against_cut = 1.0
armor_reduction_factor_against_pierce = 0.65
armor_reduction_factor_against_blunt = 0.65
horse_charge_damage_multiplier = 1.0
couched_lance_damage_multiplier = 0.75