Casters are already stronger than martials, and you get fireball next level, you will not exactly be too weak with your AOE spells.
I am in theory fine with buffing some AOE spells (though imo it is not necessary), but NOT reducing spell saves. As I said, a few hit points can go away quickly, and hitting a save or suck spell has far more effect on a battle than an additional hit or two with normal attacks.
I think you overestimate what attack roll spells can do. Sure, Eldritch Blast, Scorching Ray etc deal some nice damage. But hypnotic pattern, or in EA Sleep, can just end the encounter!
And this difference gets even stronger on higher levels. Wizards do not need a buff!
