There are a couple of problems i can see right off the bat. Personally, I never use only one screen on halftone jobs on black.. one of the problems is that there is solid white in the image, meaning.... to get the solid white to cover correctly , using a fine mesh screen on a manual press, double stroking is almost always necessary. The problem there is if you double stroke to get the white to cover well, you are going to have serious dot gain on the halftone part of your image. Common sense normally says that 1 screen should be fine but in reality.... I would print underlay one stroke, maybe even a gray screen for the midtones, and a highlight white for the solid parts of the print only.. Alot of times its best to trial and error it.. That's the only way you can really get a sense for these types of jobs