You're still making all the same mistakes.
Things like heighten will not help you in any way.
You maxed charisma at creation while keeping CON 2 points under maximum, and then pumped con at each level completely wasting your charisma points. Your extremely low CHA is doing absolutely nothing for you, and yet you still maxed it out at creation? And whats the deal with raising every other stat except wisdom up to 10?
Melfs - worthless once you move past the harbor.
Dismissal - will never land
Banishment - will never land
Power Word Kill - is a broken spell
Seriously though.. you're already 8! CHA less than your standard human Sorc and even they dont have an easy time making save spells stick in end game content. You might as well start with 10 to 12 CHA and be done with it. If you stick some points into STR and pump that with all your level up points (you are not going to miss 40 hp... trust me...) then you'll at least have a legitimate reason for not raising your casting stat...