You're gonna need some humidity when drying to slow down the process. Thats the only thing I know of that will alleviate the problem. I have a roll of Kodak Elite Chrome that cupped on me, it just happens at certain times of the year. The emulsion gets TOO dry and shrinks more than it should, resulting in a slight cup. My cure is to let it hang in the shower after steaming it up, bonus is reduced dust.