Hmmmm. . . I can see where it would be fascinating, though my own bent is towards other fascinations!
I haven't noticed (or "registered") "y'all guys," but I bet I do now that you've called it to my attention. "Yous guys" does stick out. . . . I never really noticed it in use "back east" when I lived in Ohio. . . but it does appear here and really stick out to my now Texan ears.
And I have heard "all y'all" though mostly I've heard it as "all of y'all" which is even wilder in its way.
When I was in Philly I used to say "gots" as in "Gots to go now." I got razzed big time for that in Africa, especially in Swaziland in a "British" boarding school, and eradicated it !