I am no expert, however I have an Old Mill with the CoaLTrol set up. I think it is important to remember that as long as the CoalTrol is satisfied it doesn't matter if your stove is just warm instead of hot. It shouldn't be any hotter than it needs to be if the CoalTrol it is not calling for heat.
I have my convection fan set to run 24/7. There is a problem with my blower that if it gets too hot from the stove it will stop working, so I run it all the time to keep the blower cooled down. So when my coaltrol is not calling for heat my fan is still blowing although the air coming off is not as hot.
Not sure if this helps or not..it's just my $0.015