Larger slashing weapons like Nordic Swords & Axes would also do half bludgeoning damage due to the weight of force impacting armor. Just like when a cop get shots while wearing bullet proof vest, its like getting side kicked in the gut, enough to break bone.
Some of the swords and axes need their weights increased and make their dmg to 'hack' which is some combo of cut & blundgeon dmg. (half & half, 2/3 & 1/3, etc)