It's the curmudgeon attitude that tends to drive people away from these forums! Hint: Nobody is asking for your approval or disapproval! If you have nothing to add, then don't. /rant
I've done the same testing on my fridge, and mine took an extra hour or so to stabilize. The common suggestion was to start the fridge the day before loading and travel. Now I know I can start it that morning (if necessary), and be good to go by lunchtime.
The sensors I'm using are made by Lascar. Smaller than yours, record for months if desired, but must be connected to a computer to download the data. Thanks for the links for yours. Those would be better for real-time data.
I purchased an Engel fridge/freezer for traveling. It has a dial thermostat, which is almost useless. Works on a temperature delta, rather than a physical number. So if I leave it in my parked vehicle, with it set 30 degrees below ambient, when the vehicle heats up in the sun, the temp in the fridge rises too.
I built an external digital controller, and 3D printed an enclosure for it. Now the temperature stays where I want it, and the hysteresis is adjustable.
The article is here:
http://www.prepared-one.com/engel-thermostat.html 
Keep nerding on! I'm with ya...
