I'm unsure how well the CHR/Pop stations in Atlanta did during the decade or how they sounded like, but with the market having a lot of northern transplants as mentioned on this board in the past, it is possible that the transplants are coming from places where CHR/Pop was more rock heavy, which is why there is so little 1980s pop on the dial in Atlanta.
Having grown up in Atlanta here is the history I remember:
CHR in the late 1970s was a two-horse race between Z-93 (which, as I recall, was getting 11-12 shares, although with many fewer FM signals in the market), and WQXI AM (790) and FM (94Q). Z-93 was a high-energy CHR, while 94Q was more of a Rock 40. There were some exurban CHR stations with some listenership like 97 FOX, WFOM 1230, and Wide 107. 96 Rock (AM and FM) had AOR all to themselves, not counting the college stations.
When the 80s rolled around, the BM/EZ stations (Peach 95, WSB Beautiful 98*, and WLTA 100) started moving to AC. When Fox and Wide 107 moved in, they also moved from CHR to AC. 94Q decided to grow up with their listeners and moved pretty rapidly from Rock 40 to AC. So, at one point, Atlanta had 6 ACs and only one CHR. I'm not sure if this was due to the infamous CHR doldrums of the early 80s, or advertisers chasing baby boomers at the expense of GenXers, or both, or a desire to get a foothold in the nascent AC format.
Z-93 had CHR all to themselves, but the energy level had dropped. Part of it was the market-leading Ross & Wilson radio show moving to NYC being replaced by the more staid Steve McCoy, part of it was the aforementioned CHR doldrums and AC becoming a bigger portion of the Billboard Hot 100. Z-93 played some rhythmic (Kool & The Gang, Gap Band, Dazz Band) but they pretty much left rhythmic to sister V-103. Z-93 added MTV hits c. 1983, but Z-93 wasn't the influence in the market they once were.
The big change was when WLTA (WARM Warm 100/99.7** by then) flipped to CHR as Power 99 mid-decade and brought a lot of energy as a CHR. They played a little rock; 96 Rock still had the AOR lane all to themselves, although in a boomer-chasing move they became much more classic rock ("Pure Rock 'n' Roll") and played very little rock by new artists, but I wouldn't have called Power 99 a Rock 40. When hair bands started hitting the Top 40 Power 99 played them, which forced 96 Rock to pick up more new rock. Z-93 moved rhythmic in response to Power 99's success and continued to lose share. Z-93 would throw in the towel by the end of the decade and flip to classic rock, which in turn caused 96 Rock to play more new rock, but eschewing alternative, which eventually led to Power 99 toying with alternative and eventually flipping to 99X (apparently without letting the folks in York, PA know!).
Net-net: No CHR in Atlanta in the 80s played rap/hip-hop unless it charted on the Hot 100 (e.g., Run-DMC with Aerosmith). And even then; you really didn't hear, say, the Sugarhill Gang, other Run-DMC, LL Cool J, etc. on Atlanta CHR.
*@David Eduardo "All Day, All Night, All Nice" was WSB 98's tagline, not Peach's.
**See
Cox v. Susquehanna.