I think WGST, when it was owned by Georgia Tech, had the opportunity to move to a clear channel and become a class A, but declined to do so. And WGST was the second radio station in Atlanta, behind You Know Who.
That's a common urban myth about a lot of stations, but there's nothing in the record to bear out any of those claims.
Here are the WGST history cards: https://cdbs.recnet.com/corres/?doc=59394
Stations that applied for upgrades always had those requests (and denials, where warranted) noted in the history cards. But there's nothing for WGST other than the NARBA move from 890 to 920 and a very gradual increase in power over the years from 250 watts to 5 kW day/1 kW night.