I still haven't playtested it, but I feel the harm / armor ranges are a little limited, and may limit combat, even though I see the intention to keep the exchange simple, but I have an alternative to suggest:
Extend the harm range of weapons, using closer values to AW, like daggers and short swords deal 2 harm, swords and axes deal 3 harm, and 2 handed weapons deal 4 harm, and also extend the range of armors: hide or partial chainmail / plate armor have 1 armor, and heavier sets have 2 armor. Shield and helmets give a different kind of bonus, if you have a shield you hold 1 more when you hit with an odd number, and helmets give you 1 more hold when you hit with an even number. And finally you can give the piercing tag to some weapons, making them more efficient against armored opponents, but letting them ignore just 1 point of the target's armor. Using the examples from before, daggers and short swords both deal 2 harm, but the short sword is also piercing due to its greater length.

As soon as I get to playtest it, I'll update the topic.