I haven't listened yet to WRRM since the tweaks, but it's very interesting to see them go this route. Especially when they're really the only AC in the market and no commercial FM is really doing anything softer.
They very well may be monitoring the situation in Miami. Also, Cincy is a pretty hot market for Classic Hits formats right now. WGRR (WRRM's Classic Hits sister) does consistently well in the ratings. Eighties-based Adult Hits WREW is very competitive. WMOJ recently relaunched as Classic Rhythmic/R&B (they're using the "Jammin' Oldies" tag, though to me what they're doing seems a little mellower than that). WRRM may be trying to grab an underserved share of the Classic Hits audience with the ballads those stations aren't playing. (It should be noted that in addition to the mellow stuff, it looks like WRRM may have also brought back some more middle-of-the-road classic tracks that are pretty much Classic Hits staples at this point.)
My guess? Cumulus is probably trying to set up WRRM as a flanker for WGRR. But they'd better be careful. Going too soft could drive 35-44s over to WREW, SuperHot AC WKRQ, or even Christian AC WAKW (which is coming off an excellent December book as an all-Christmas and has added a noticeable amount of "positive mainstream" material lately).
Good point on the flanker idea. THey are certainly going against the grain of what A/C's stations are doing today.