Arturo,
I am not Frank but I will share my experience with this method.
After I saran wrap my tubers I store them down in our pump room in the basement. It stays between 40-50 degrees Fahrenheit. I don't know how it compares to your humidity. But because it is a pump room is not exactly dry.
I do not dust my tubers before storing. I just make sure they are good and dry. Both years I tried this method I got some fungus on one variety of my tubers. The same variety that would get fungus stored with other methods previously. And last year I had one other variety get a bit of fungus.
But the fungus did not harm my tubers. I simply left them out to air out and gave them a heavy dusting of cinnamon. Once planted they grew just fine.
