Armor is all wrong in Conan. First, it advertises your attribute build, which is just plain wrong. All light armor should start the same, and all medium armor should start the same, and all heavy armor should start the same.
Cold/Heat protection should be one Modification slot.
Extra Armor, reduced weight, gliding joints, etc., should be another slot.
Attribute Boosts should be another slot, with potions made in the cauldron, being what modifies it. The higher level the thrall, the more powerful the boost. This provides 5 levels of perks from potions. No thrall, perk level = 1. Thrall level 4, perk level = 5.
No thrall should be able to make all potions up to their level. But Purge Thralls should have more specializations. It should be like a pyramid for each thrall’s abilities. So a T4 should be able to make every potion to Perk level 2 or 3, many of the higher levels, and just 1 or 2 at perk level 5. Purge Thralls should add specializations.
Heavy, medium, and light armors should have natural characteristics. They do this to some extent as it is. Climbing for instance. But sprinting should be slower and drain more grit, the heavier the armor. Mods and perks could mitigate this some, but heavy armor should still not act completely like light armor. Close but not quite. I think this would give more options to build armor for your play style and weapon choice.