About that spotting: I've gotten the same exact spotting from the Unicolor kit. (I don't have access to Tetenal and haven't tried other kits, so I don't know if the spots occur with them.) I've tried mixing a couple of drops of Photo-Flo into the stabilizer upon mixing it up, which helps. Or, when you find you've gotten the spots, moisten a small sponge with stabilizer and wipe down the non-emulsion side to remove the spots. But whatever you do, don't moisten the sponge with Photo-Flo like you might do with B&W film: on C-41 film the Photo-Flo just seems to make a "greasy" coating that just stays on top of the film.