One thing to consider about UNC-Chapel Hill and also NC State is that out-of-state freshmen are limited to 18% of each incoming class at both schools, which makes admission even more competitive for OOS applicants. (I think that a year or so ago over 40% of the applicants to UNC-Chapel Hill were OOS; and the OOS children of Carolina alumni have a higher admit rate, due to slightly more consideration from the admissions office.
Also, my observations about OOS admission to Georgia Tech is that your chances are better if you are a class valedictorian or salutatorian.
Generally, if you look at the Common Data Set for a college or university, Section C7 tells you how certain academic and non-academic factors are weighed for admission; and Sections C9-C11 of the Common Data Set will tell you the objective criteria for the matriculating freshman class. You might want to look over these sections from the respective Common Data Sets for all the schools on your list, and see how you compare to recently matriculated students; that may give you a rough idea about your admissions chances.