Contact CoalTrol first. Call Neil or Paul.
Also, have you checked your Draft / Baro Damper and have it calibrated correctly with a draft gauge?
You should not have to mess with the Menu setting too much (or at all). Other than the MAX and MIN to get your stove dialed in for optimum burning.
(Whats;s your MIN/MAX setting at currently).
How much of temperature setbacks are you using? Most of us don't use them, because coal take so long to respond and if your setbacks are more than a couple degrees, you will have overshoot. ie) If you have them set at 65 and then raise them to 70 or 72, that will really get the stove cranking and then it will take a long time (1-2 hours) to settle down and normally overshoot the setpoints.
The stove will only get so hot, even its maxed out, there's nothing to worry about, it will just be really hot. I have run my stove at max when it's below 10 degrees outside and it runs just fine.
I have had my CoalTrol for 3 years and Zero problems. I leave it at 68 most of the time and maybe raise it 1-2 degrees if I need too, but maintains perfectly.