[@Witch Cat] The divination and health manipulation was backwards. Divination is demonology (as the demons have such esoteric knowledge) and  health manipulation is morphology where instead of casting it on yourself you change other people to a healthy state.

Now while I admit it is vague, but the line before is "With knowledge of the raw arcana and mana that permeates reality they can affect the world in precise ways" This was intended as their magic has to affect the world they refine it into spells with various abilities rather than just blasts of energy.. The more important point is that it is SPECIFICALLY stated as a demonology skill "raw magical control  (blasts of raw arcana and other ways to weaponize it)". Now I'll admit it was vague and I'm sorry about that but it was still defined. The classes are meant to be largely mutually exclusive. The Ritualologist is the one with the most cross over as they have access to the same magics (except demonology), but use rituals and tons of ingredients instead of tons of mana.

As for the jack of all trades thing I'd suggest you put down everything but hunter. Witches brew potions (alchemy), cast spells (arcanology), do a bit of demon speaking (demonology), would probabaly use rituals for some spells (ritualology), and if you want healing then you need morphology. Since you are so spread out having demonology really isn't an issue since you're only 1/5th a demonologist. This way you get a little of each and lots of variety.

EDIT: If anything my best guess is that you are thinking of familiar as a generic when in this universe is is specific. Familiars are only demons/infernal beings from the infernal plane (hell) used to channel the ether. They are not just magic pets.

Familiars are only ever refereed to under demonology. I don't see them any other place. it says the a familiar is require to channel "ether and mana" ether is only for demonology magics.

Also I totally will agree my formatting sucks. It's just not my strong area. I'm way more of a concept man.