Like he said, reduce your min down by 1 point at a time, and WAIT for an hour or more, If it's still too warm, try another 1 point lower, and wait till it evens out.
However, don't lower it too much to loose the fire OR your draft. Always keep an eye on your draft, and have a working CO detector (or two).!
Even at idle, it still can put out some heat depending on your heating situation. Check your FR (feed rate), it is it at Zero (0), then it's just the Idle/MIN settings above.
DO yo have another digital thermostat nearby, what is that reading? there is a way to calibrate the thermostat in the CoalTrol if it's off by a few degrees.
Make sure your thermostat is not blocked by anything, it has to have good air flow around/thru it.
Where is your thermostat located in regards to your stove?