There is a huge balance problem with the crafting system. When you ramp the difficulty up to Master all the skills take a lot longer to level including crafting skills. I barely got 4 skill points for making 150 potions in alchemy, from 16-20.

This means that at Master level you would need to make THOUSANDS of potions to max the skill which simply [censored] by the fact you will spend grinding materials and making potions for tens of hours, this is not a MMO.
Now, it's not a problem when you can just downgrade difficulty to make items, but it is annoying and should be included in overhaul mods by whoever is gonna make them.