Black and white tritone for offset printing

Hi,
Im about to print a B&W book, and want to do it with three different inks (black, a dark worm grey, and a light grey) I prepared the files in photoshop in Mode/duotone and choose the three colors.. Id did some test with the offset press, I got quite good results, but I noticed that the black and dark grey are working in the highlights, which generate a grain. I want only the light grey working in the highlights. How can I control this? Should I work the duotones curves?
Thanks!

Yes, the curves will help. You can also determine how the colors overprint. The Black and Dark Gray curves could look like a "bell" curve, while the Light Gray would appear as an inverted bell curve ( if that makes sense ). You will see results as you adjust the curves. Good luck, sounds iike a nice project.

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