Yeah you're making like a million class features haha

One thing that is helpful when homebrewing a class is to start with a little. My personal strategy would be to pick like 5 vestiges and balance them, then add the others.
I would decide some specifics, like this:

Name of Vestige
flavor text
Specific Summoning Reqs
Manifestation
Sign
Influence 1 (personality quirk)
Influence 2 (new flaw or bond)
Boon 1 (passive benefit)
Boon 2 (passive benefit)
Favor 1
Favor 2
Special Favor

That way you're working with a formula. If each vestige has the same number of things, balance will be much easier.



When it comes to the Soul Sculpt thing, the "evil guy who enslaves" and the "nice guy" one both get the standard 3-4 archetype-specific features, but the nasty guy gets spellcasting (very limited, but still!!) as one of his. It is a good idea to remember that a spell is basically a class feature. That's why 5e wizards have such a barebones class table. They are always getting new spells. Essentially what I'm saying is that the Binder class gives the bad guy objectively more class features than then nice guy. And that doesn't even go into the lack of synergy between the nice guy's extra abilities.

Lots to think about!