We were using the martial law critical tables but the adding and subtracting of damage considering the various armors was kinda clumsy. As a result I'm making excel copies of all the critical tables in martial law with the unarmored modifiers added in and all the armor wearers get to subtract damage accordingly.
We did something similar in our game. We created our own modified excel spreadsheets with the Martial Law adjustments so that we would not need to calculate the damage. For example:
81-85 Slash (Description has been removed to comply with copy right laws)
Hits Stun Bleed Modifier
(N) 16 2 2 -30
(S) 14 1 2 -25
(R) 11 1 1 -20
(C) 8 1 -15
(P) 6 -10
(N) No Armour (S) Soft Leather etc...
(We don't include Plate/Chain. What we do is have Plate for torso and back {4-7 on hit location} and chain everywhere else.)
Also, we reduced the bonuses/penalties of armour so that there is only a 10 point difference between Plate and Unarmoured instead of 20 and modified stun/bleed as well.
Basically we took what we thought was a good idea and remodelled it to what we prefered to use in our HARP games.
And our monsters are considered Unarmoured unless they have Tough Hide, in which case, their armour adjustment is the same as their bonus. (+20 Soft Leather, +40 Chain, +60 Plate.)