Skenny, the "proper" pH is a bad idea. Any sort of pH altering chemical starts to be dangerous territory.
Your water is like Amazon black water. Angels like that sort of water, it's almost exactly what they have in their natural habitat. Same with cory cats. Leave your pH and gh
alone (unless you are trying to go with plants). Your kh
is actually perfect.
What size tank do you have? That would help us give stock suggestions. BigJim is right, I would love to have water like yours.