I deal with some 24p video shot on my Panny DVX-100B often in AE, and I have always just right-clicked on the video in the Projects area, selected “Interpret Footage”, “Main…”, and “Guess 3:2 pulldown” before I begin working. This always seems to have worked for me. I don’t use the “24pa” button, as this is the advanced 24p, which I do not shoot in. Does this have anything to do with what you are talking about? [I got sorta lost in your discussion].
Regards,
Ed