Do most archers use medium armor and what is the difference in the 3 types? What stops everyone from just using heavy armor?
Archers usually use Light armor. More mobility, weighs less (less extra weight you have to carry), and light armor probably has more of the stealthy enchantments on it.
Speaking of enchanting, you can make an Alchemy potion that fortifies enchanting, and you can enchant an item to make potions stronger. Does that mean you can just keep making an item that has a greater and greater effect for potions? (Use "Forify Enchanting" potion, then make a stronger item that has "Increase Alchemy" [Not correct name], then equip that new item so that you can make a stronger "Fortify enchanting" potion, then use the potion to make an even stronger "Increase Alchemy" item, then keep repeating)