Having the oversized coil with extra surface area will increase the contact time the refrigerant has with the circulating air stream. The extra surface area will help because of the reduced air quantity.
Im in NJ. What is a "typical" enthalpy change-over setpoint for differential enthaply control of an air side economizer?
What about the drybulb override to close the dampers?
At what point is it more efficient to close the dampers and reduce the buildings return air enthalpy instead of...