Just on a curiosity and to be clear RetMilOfctFL, you had already
figured out that the temperature sensors would achieve what you wanted
to as a workaround before I posted the same workaround?
I don't believe there is a way to adjust the thermostat calibration or
swing temperatures. However, what you could do is purchase a temperature
sensor and put it in the room with the lower temperature and then you
can tell the nest thermostat to use ...