Your smoker will now start coming up to temperature. Keep the lower vents open until you are around 50f away from your target temp, at this point you will need to close both lower vents down so they are only open 1 hole on each side. This will slow down the rise and stop the smoker from over shooting. You can make fine adjustments from here to dial in your desired cooking temperature. Opening the vents will make the temperature rise and visa versa.