What's wrong with how it's working now, for Normal?
It's been explained a number of times, directly to you. I'll try once more.
UNLIMITED LONG RESTS ALLOW FOR AN EFFECTIVELY UNLIMITED USAGE OF SPELLS.
UNLIMITED SPELL USAGE MAKES THE IDEA OF LIMITED SPELL SLOTS A USELESS MECHANIC.
THIS MAKES "NORMAL" FAR TOO EASY.
It makes just everything far too easy. I am soloing the game with a wizard at the moment and there is not a single encounter that gives me the beginning of a challenge.