How long has it been sitting above the setpoint? How long has it held a FR of 80? Is it reading a 78 as the current temp or are you getting this from another thermostat somewhere? If the later, what is the Coal-trol reading as the current?
Please give it a couple hours to settle out after starting it. Don't change the setpoint or try to force it to do anything. A lot of times people will have things plugged in for a while before starting it and the setpoint will be above the current temp in that period. The control, thinking the fire is going, will start to build up a high FR. Once the fire is started, the control having built up a large FR will result in a large overshoot. The best way to avoid this is to, before igniting it, set the setpoint a couple degrees below the current room temp and leave it for 30-60 minutes. Then light it up and put the setpoint where you want it. This should avoid the major overshoot on ignition.
If the problem continues give us a call tomorrow to see if we can get it figured out. 315-299-3589.