Tim has got the solution, or at least a good one. To fight static charge, it helps to up the humidity in your work area. I do all my holder emtying, cleaning and refilling in a small bathroom that I leave wet towels hanging around beforehand. It's the only room in the house that can be made light-tight with a bedcover clamped between door and frame, too. I think your film changing tent is part of the reason you have dust problems.