Kinda curios as to why the rate of coolant cooling is even considered. The thermostat will cycle just as the fans do, and will keep the temps regulated to an overall lower temp. The amount of heat transfered has little to nothing to do with it the way I see things. The overall idea is to control the level of heat in the motor. So long as the rate of heat transfer from the coolant/radiator to the air, is HIGHER than the rate of transfer from the motor to the coolant, then the coolant temps will drop with a new thermostat. In any decently designed cooling setup, the radiator will be able to dump more heat than the motor can produce (assuming XXXcfm airflow). In traffic, I can see the temps being regulated by the fans, as that is the airflow regulator. On the highway, or about anywhere constant over 35mph or so, the thermostat will be the controlling factor.
So the way I see things, to get the best use of the thermostat you need to alter the fan settings as well. However assuming some movement, I can't possibly see how the 160 is in any way a waste.
