Personally I'd avoid anything with TSH name on it...except Compass.

If I were you I would try PDT or PSA. Both are in CLT and PSA has a base in TYS as well.
I wouldn't believe a thing GoJet told me except "you'll average one mechanical delay per day at minimum" (no offense to anyone working there). The upgrade at TSA might happen. Just keep in mind, when quick upgrades are promised because of growth, it's easy to fill classes until the first half of the hiring due to growth is complete....