Allow me to offer the opinion to counter these nay sayers....
All I ride at Flatwoods is a SS 32x16 (32x17 will be just as fine, anything bigger and it will be a great spin class for the next 25 miles). Just like everything we ride on any bike Momentum is thy ally. Keep on top of the gear and you'll be fine, however, panther, indian, gator bait, heartbreak ridge....these trails will require some out of the saddle effort - and with all the roots you wouldnt want to sit down anyways dude.
I have a grand time on my SS there, esepcially when we stop because other folks have the cool spanish moss all up the cassett - happens dang near everyride. Not any climbs to worry about Flatwoods says it all. gas up the SS and enjoy the trails that place is about as SS freindly as it gets. Just my opinion.
At the end of the day ride what you enjoy cause aint that the point?