I move the paper in a circular motion, pulling it almost completely out of the slot a few times during development. I have never had uneven development, not have I had the emulsion side of the paper stick to the side of the slot. During development, the paper is pretty much in constant movement. The tricky part is moving large (11x14) prints from slot to slot. I grab the far corner of the print lightly with my free hand to do that, rinsing that hand in the wash tray between to avoid staining the print. As far as fumes, because there is so little air exposure, it is much less than trays.