Unfortunately many vids of the well-known experts had me thinking that this fingertip position was "wrong"
Everyone's hands are different. I'm sure I'll blow this wide open but to paraphrase... "If it's wrong but it works, it's not wrong".
I know a guy who shoots "cup n' saucer" and does a very nice job of it. Well we've known for a long time that "cup n' saucer" is no good right?