I don't like them
the best way to learn about his signature is to study known authentic versions, like Tri-Star certfied, over the many years of his career. Once you get used to recognizing what an authentic version looks like, the fakes will become apparent.
psa and jsa will only confuse you. they get it wrong more than they get it right (Bradys). Just look at Tri-Star authenticated examples. I rarely get into technical details about signatures.
I sent you a PM with one hint. That will have to do. I don't do detail technical analysis. There are others on here that might want to give it a try.