I guess this is too late for Troublemaker, but for others with tight connections in ATL...

Don't sweat the layover too much. We once made a 43 minute connection on a Saturday. We even had to go nearly the entire length of the airport to get from where we deplaned to the international gates. Like, jojo said, the tram (known as the APM for "Automated People Mover") is quick and efficient. I do have to admit to a sigh of relief as we sat on the plane and saw our bags on the tarmac waiting to be loaded. I was more concerned about our bags not making it than us missing the connection.