That timed blast of the fan idea would be way better than the constant fan, but I say try it without it first, you'll be surprised that you don't need it. The circulators run 24/7 to keep all the water at a even temp. Shutting them off in any way is'nt gonna gain you anything other than waiting for water to get hot. As far as the aquastat on the stove, where ever you set it, the water temp will usually go a couple of degrees over the high limit after the damper shuts off. It will open the damper back up when the water cools down 10 degrees and bring it back to the high limit temp. Nothing to really ponder, just let it do it's job! I'm sure you'll be really watching it when you first get it running as we all did, but that goes away after you've had it a year or so!