Don't get to frustrated. You will get this ironed out before you know it! A little caution on leaving the loading door cracked open on reload for 10-15 minutes! Many times that would be a awful long time with exceptionally huge stove temps! I would rather only use the open door method long enough to get the new load involved. Close the door snugly and let it burn on high for the duration of your initial high burn time. Much safer. Hate to hear of somebody over firing a new unit. Your excessive coaling is from constant reloading and/or a combination of damp wood and to much reloading. Try mounding the excessive coal pile near the front of the stove. Now try laying a small dry split on top of the coals. Close the loading door. Leave the primary air wide open while this split burns down. Normally it will take a pile of coals down with it. Repeat as necessary if required and you have the time. Something to try.