I've been looking into Cayce and, as near as I can tell, he was about as psychic as a generally decent stockbroker. He really watched the trends of the times and most of his "predictions" pretty much came out of the then-current editorial pages.
For example, he was a big proponent of chiropractic at about the heyday of chiropractic. He claimed to have cured all sorts of things - including viral encephalopathy - by advising a few skeletal manipulations. And my favorite Cayce prediction came in 1934 when he predicted that Hitler would soon come to power in Germany. I'm not sure you can call that psychic, though. Hitler had been elected Chancellor in 1933.