Changes

*You didn't say if you were using plates or film. For film, use a piece of clean glass to support it. Stick the film to the glass emulsion side down a la index matching and squeegee the back. The remove the film, squeegee the glass dry, and stick the film back onto the glass emulsion side up and squeegee that side last.

*For glass plates, the sharp edge of the glass will make cuts in the rubber blade, which will leave streaks next time. To minimize this problem, make a jig that keeps the wiper blade in the same position relative to the plate every time. This way the cuts will always be close to the edge of the glass.