Hello and welcome. I am sure Dave from LL will respond to you and tell you about the details of fine tuning this wonderful stove but he is busy man this time of year so make sure first you study the manual for your coaltrol e.g.Tips & Tricks
I am not sure which version of the coaltrol you have but just reviewing this example for your stove may solve your problems.
Coal heat is not like oil heat in that you have to anticipate your heating needs a little better and you will see constant referrals to window stats. This means the downsides of cheap energy is that once in a while you learn to bleed off that xs heat by opening the window. As you get better at it in your application you will do that less and less but get used to it as the upsides are overwhelming. Once mother nature decides to do her worst this will be the least of your concerns.