Seems I remember some significant ads in the Observer stating something like, "WEZC has moved and can now be heard at 102.9". A little misleading, but then I also hated how the new Mix104 was also a bit misleading. They made it sound as though the callsign (legal ID) had been changed to WMIX. I remember their Legal being crammed into a millisecond blurb in the middle of a stop set: "WMXC Charlotte 104 FM". This was the beginning of a new trend, which moved away from stations doing their ID within 2 mins of the top-of-the-hour. In other words, the beginning of the end of radio that most of us grew up with. The 96.5 in Fayetteville -- licensed to Laurinburg -- also did the same quick ID with the same voice guy. Were they co-owned at the time?
The real WMIX in Mount Vernon, Illinois was more than likely responsible in WMXC's dropping of the phony-baloney "WMIX" call-sign. From what I've learned, they were aggressive in issuing C&D letters to other "Mix" stations that were using their FCC-licensed call-sign on the air (Baltimore's WWMX and Louisville's WLRS were two other stations that were IDing themselves as "WMIX" during this time and were forced to stop using it as well and I'm sure there were others).
As for ownership of Mix 104.7 and Mix 96.5 (WMXF/Fayetteville), IIRC, WMXC was owned by EZ Communications while WMXF/Fayetteville was owned by Beasley Broadcasting. Both station did use the same VO talent (Mark Driscoll) during that time.
And I agree on your opinion about how radio stations would use quick legal IDs during stopsets. Like you, I've grown up when radio stations used to use their call-letters with pride in IDing themselves. Nowdays companies don't care, they want to be another "Kiss" or "Power" or "Hot" etc.
Hope everthing is going well with you these days.