I vary between options 1, 3 and 5 (“you”, “y’all” and “you guys”) depending on context (including whom I’m addressing and how formal I’m being). I’ll also use other forms occasionally, including “you all” and “the X of you” (where X is, of course, the appropriate number).
Thank you! I say “y’all” and sometimes “you guys.” When I’m dorking around, I’ll say “yous guys” or just “yous” which is pronounced more like “yiz” than “you” with an ‘s’ at the end of it.
3 out of 3 for the Paddies 
Ye for me too.
ETA: I am a jackeen BTW 
I use y’all often, generally with people I don’t know or who are older than me. It’s the register I use when waiting tables or working a cash register.
When I am with good friends, I tend to say ‘guys’ or ‘you guys’ - regardless of gender.
Y’all is singular.
All y’all is plural.
That’s what the majority of native Pittsburghers use.
You left out “yinz.”
I voted “you” because that is most common for me but I also use “you guys” and “y’all” with statistically significant frequency.
And yes, it does make for some awkward phrasing sometimes.
Went to school with a buncha Picksburghers. Heard yinz all the time. I think it might also be common among NE Pennsylvanians, but I might be wrong.