What do you mean by "He has the feed rate set at 85"? Are you speaking of the "FR" screen? If so, that is a display only, you can not adjust the feedrate directly through that screen. If you are talking about another screen, please let us know.
If the FR screen is reading 85, and the setpoint temperature is being well maintained (of course give it a few hours after lighting it up for things to settle in), then there is no problem. The loading conditions vary from house to house, installation to installation, and from day to day as the weather changes. This FR screen just gives you an idea of how hard the stove is having to work to meet the temperature setpoint you have set.
Coal source can also play into how high of a feedrate the Coal-trol needs to run to meet temperature, but again the Coal-trol will account for this automatically since it is simply going to home in on the FR necessary to maintain temp regardless of why the load is the way it is or what the burn characteristics of the coal you're using are.