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One thing that will help is to eliminate the color sub carrier from the video going to your modulator.
On an LD player if there's an S- video output make an RCA adapter cable that only connects to the monochrome coax in the S-video coax pair. Newer component video sources just use the green Y video cable.
Many monochrome sets made before color TV was standardized had video response out to 4.5MHz later sets limited the video IF bandwidth to ~3MHz to hide the chroma dot crawl.
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