Robert Monroe was the founder of the Monroe Institute, his book Journeys Out of Body is very good but he has a few books. Otherwise I think your current reading list is fantastic. I would recommend Targ when you get a chance, he has several books all of them good.

Captain of my ship, master of my soul is fascinating for the true history behind the psychic spy program. The body electric is less about Psy ability and more about biology, but it provides a foundation for how this all is actually real.