Sounds like a great setup. Regarding calibrating your thermostat, is it a mercury switch? If so, some of them can be calibrated by simply levelling it (or moving it slightly off level, if it is a bit off).
It is far from necessary, but I picked up an indoor-outdoor digital thermometer, the kind with a small probe on a wire. It records maximum and minimum temps over time, which I found really useful for adjusting my fridge. Just a thought.