[CigarInspector]

I am slightly confused by one portion of your post. You talk about moving your hygrometer from box to box. How long do you reseal the box and let it sit before reading your hygrometer? The simple act of opening and closing the box affects the humidity of the box. You could easily be reading an ambient humidity level instead of the sealed humidity level the cigars experience.

Time should correct the problem, but I suggest leaving the hygrometer in one box for a day or two and reading it through the lid, without breaking the seal. That is when you get an accurate reading of the box's current humidity level.