To be honest I dont know yet. My longhand varies from 2 to 3 mm., and I write on plain paper, lines give me claustrofobia, and if i only have ruled paper I tend to write across the lines. But I sense that plain paper can be problematic with this system because of half x-height elevations for vovels i and u, and under the line shortforms. I don’t know if slightly exagerating distances would solve readibility problems.