Getting lines from punch to tail on black screen plates, 175lpi @ 2400 dpi, 45 degree black screen angle. I know the platesetter doesn't know it's making a black plate vs any other, the 45 degree screen angle on the black plate being the only difference. Most noticeable at 50% and below. I couldn't see it on the plate at first and thought it was a press problem, but it can in fact be faintly seen on the plates before going on press, just becomes much more visible when inked up. Lines are narrow less than 1/8 of an inch and are in bands about an inch and half apart. Thought maybe processor but lines appear in the same direction regardless of the direction plates are ran through processor. We are running Fuji LHPJ's though a dartIII platesetter, Rampage workflow. Any ideas??