Gambler, when you call you'll be talking to Neil. I'll send him email tonight to explain a bit of the situation to give him a heads up.
A couple of comments/questions though:
1) Was it substantially warmer in the room where the stove is compared to the room where the thermostat is? If so, this would indicate an air circulation problem. Depending on floor plan it can be very difficult to get the air to move around, even with the use of a fan. Instead of trying to blow hot air out of the stove room, try "sucking" cold air into the stove room, especially if you're using a floor flan.
2) In the experiment you mention, where it ended up at 70 degrees with a setpoint of 71. What was the setpoint change you made? You said before the experiment things were idle with a temperature reading of 69 degrees. What was the setpoint at during this time? During the two hour experiment had the temp at the thermostat gone over the setpoint of 71 or was it still "lagging" and the feedrate was still climbing very slowly?
3) What brand/model of stove are you using? What is the max BTU output of the stove? What are your MIN and MAX setting in the SETUP menu? Sometimes in the fall and spring when the outdoor temperature is not that low it can help to set the MAX lower than usual. This has the effect of making each point of feedrate (FR) actually translate into less stoker on time. This should help minimize the chances of "overshooting" in "low load" situations, such as when it is 50 degrees outside, especially when the heat from the stove is not efficiently reaching the thermostat.
We will do everything we can to get you up and running to your satisfaction, but please bear with us as we work with you to try and figure this out.