Wow!!! That’s pretty awesome. Using a data logger really shows how well your system is doing. In your case flipping awesome!!!
I just spent the last hour trying to get excel to chart my log, with only a small amount of success. Can I ask someone to send me an excel sheet with the charting format already set up please?
The calibration of your logger maybe be off (the actual value, example 65%h) but it should show the change spot on (example: so if it says it went up 1.5%, it really went up exactly 1.5%. Verses it say 1.5% and it really goes up 2%). Either way your logger should be close enough not to worry about for how you are using it. Plus using your taste buds to get your right RH is the most important here. I am not a temperature & humidity calibration expert, but I have had some training in the calibration area.
I am looking forward to seeing your updates on your humidor.