In purly paint terms, crazing is normally what happens when you spray laquer over enamel, the result looks like the surface just has cracks in it. This happens when the substrate absorbs thinners, and swells slightly, the top coats dry, then the solvent finally evaporates from the undercoats shrinking and pulling the dry top surface apart elaving minature grand canyons. You can fill them but the same problem will continue to occur,,
My guess is that the dye is a problem, or that there is some sort of sizing on the paper, though if the nitrate skims off, leaving solvents in the undercoats, when you hit it with lite coat, it will not allow the solvents to penetrate the skim layer on the nitrate and will cause swelling and crazing,,
what thinners are you using in your material?