Those maps are whack. I was in Macon a couple of weeks ago visiting my sister, and I could basically get every Atlanta FM like it was local. Hell the reception was actually better than where I live in FM overload hell. The ones that really stood out were . 90.1, 92.9, 94.1, 94.9, 95.5, 96.1, 97.1, 98.5, 99.7, 103.3, 104.1, 105.3, 106.7.
All of those are big class C-somethings, with 97.1 and 106.7 being full class Cs with a line of sight towards Macon that doesn't include downtown ATL. 104.1 and 105.3 are south of town to boot, also with a clear line of sight. The only surprise IMO is 95.5, which has the clear line of sight (same tower as 97.1) but much lower power and HAAT.
How did 105.7, 96.7, 107.5, 107.9, 100.5 come in?
Those frequencies were not audible because Macon has a station at 105.5, 95.5 (Peach), 100.5 (translator I believe), 107.9 was listenable but not great. I was near the Idle Hour Country Club off of Forsyth RD. I was using a http://www.ccrane.com/radios/shortwave-radios/ccradio-sw.aspx#.T507gNnhlio