having a problem controlling the low temp with this smoker. it is a charcoal ok. joe with a fire box on the side. just sealed the cooker side now I need to seal gaps on air dampener. as it is now the only way to control the temp is by the amount of charcoal added. i won't tend it like that, if sealing does not work I will put a dampener between the two compartments so I can fill the fire box and walk away for a while. the chimney dampener is not the answer here. is this the norm for a charcoal burner? your thoughts please.