I guess it really just all comes down to who you talk to! Whenever the residency issue came up, I felt like they just kept referring to the "32 page manual" that outlines the steps you have to take. No one had a straight answer, which was what led me to believe that it's probably pretty difficult to get it. The student I talked to about competitiveness was a P2, so you're probably right that it just depends on the class.
UNC definitely has a great reputation, and North Carolina has been a state with progressive pharmacy practice. There would be a lot advantages in attending, but I'm just not sure it was a good fit for me!