If your 2 stage furnace has a VS blower. Then it can probably be se to either 350, or 320 CFM per ton, to help keep the humidity a bit lower. Next, is the furnace wired to use both stages, or did the installer lock it into second stage. Also, what brand and model number thermostat do you have. Also post full model number of furnace. the model number will be inside the panel where the gas valve is.