As most of us know hits to the head to double damage, but the problem is the damage is doubled before the armour soak and reduction, so soak doesn't work as well as it should.
Another (And better, but more complex) way of achieving this would be changing the multiplier to apply for the final, not the initial damage.
Another (And better, but more complex) way of achieving this would be changing the multiplier to apply for the final, not the initial damage.