Am I understanding you correctly - you only have 2 options for the fan turn on point with turn boy - 212 degrees (OEM) or 201? There's no adjustment lower? If so, that's lame.
I will still need a switch or some way to fool the sensor into thinking it's hotter than it is (resistor). What else would this effect through?
With the Tuneboy software, you can set the fan to turn on at any temp. I set mine at that level based on recommendations. The fan will likely never turn off if you turn it on much lower. But you can experiment with it if you like.
Remember, with the Tuneboy the fan will always turn on at 217 for the first event. This is done to remove the pressure from the system. After the first event the fan cuts on and off at the temps you set.