Hi Jeremy, there is a builder Kelly Hart who used papercrete over earthbags. Not exactly cob, but it is a type of rammed earth. Here is the link
http://www.earthbagbuilding.com/projects/hart.htm He does report good insulation with it. The only concern I would have in your climate is the moisture. Most papercrete is done in dry desert like environments, I always thought of SC as humid. Since you live in the South, you should investigate doing rice hulls in earth bags. It is insulated, faster to build then cob and cheap. You live closer to the major rice states ie Missouri, Mississippi, Alabama. Often times you can get the rice hulls for free. It contains high silica like strawbales, so it insulates, resists mold, fire etc, but that probably belongs to another thread. Good Luck