For real, ya'll doesn't even make sense. It's just nonsense from people who are used to contractions that involve will, like you'll/etc.
This is literally worse than your PaRD topic, because it's seriously extra horrifying to think of moving that apostrophe for no good reason other than your feelers.

Y'all is literally the only thing that makes any sense at all, because the apostrophe goes where the letters are missing. That's why we have apostrophes, for the most part.