Hi Scotty,
I suggest you post this on the Using Bituminous Page. The guys who burn BIT will see it easier there. The first thing that jumps out at me is that you are overfiring the stove. Do you have any thermometers on the unit? If not pick up one at Walmart or local hardware store. Knowing how hot the stove is burning can help you burn coal more successfully as well as protect your stove from damage. Most stoves can routinely burn at 500 or 600* but anything hotter is considered overfiring. Overfiring the stove doesn't accomplish much more in heat production but does cause damage to the unit. If you are running your stove this hot or hotter constantly to reach the level of heat your want, you need to look at adding a bigger stove capable of producing more BTUs or adding a second stove on the other end of the house. I'm sure the BIT burners will be a long. Pictures will help if you can post them. Lisa