if it came with 3 humidifiers, then use the 3. just let it slowly settle back to the 70% mark. once its gets there, then we can fine tune it. another thing you should do is your own calibration of the hygrometer. you will need a Boveda(any% will do the job) and a clear kitchen canister with the flip top lid, clamp and gasket. these are the common canisters that you see in the kitchen stores. they work awesome for calibrating. i do not like to rely on anyone but myself for calibrating. screw the salt test. my way is 100% accurate.