Caisob, I think you might be surprised about the lack of crowds on GA Traverse.
You might find a few small crowds of people in campsites or parked alongside the trout rivers/streams but there are so many miles of roads/trails as well as dispersed campsites which make up the Traverse that you probably won't see more than a few folks but it shouldn't be bad... For example, if you find a campsite you like and if it's full, just drive another 3-5 miles and you'll find one, or more, which are unoccupied. Note that I'm referring back to your comment about "...the week before or after..." which includes only one weekend (a bit more people on weekends) but during the week traffic is MUCH less.
One word of caution regarding "traffic" is that fall (just before and during OB East) timing is during or near deer season so you may see wide variety of vehicles travelling thru any/all of the Wildlife Management Areas (WMA). Some may be just "scouting" others may just be parked and off hunting in the woods. But other than the WMAs traffic and camping is not a problem. However I'm saying this without looking to see dates for hunting season this year vis-a-vis the OB East.
So all you might need to do is look at a map of WMA's in N GA and make plans to camp in areas that are not inside a WMA.