I started not to say anything because I thought I might come across sounding like a north GA trail Nazi. I would just hate to see a forest ranger get a shiny orange KTM without having to pay for it like the rest of us!
If you make it back up this way be sure to check out the Oconee national forest located east of Atlanta. There is some great, motorcycle only, single track in the Towns Creek ORV area. A little further east is the Durhamtown Plantation which is billed as the "sportsman's paradise". Lots of ATV and motorcycle trails. It can get a little busy on the weekend though. The Oconee NF is also chocked full of service roads. You can easily link up 2 days of riding on nothing but dirt in this area. Watch out for hunters in the late fall.