What I figure, is that I know Tmax can take many stops of overexposure without changing tonality too much, because it has so much straight-line. So I figure that if I expose enough that the corners get enough exposure, I will hopefully be able to dodge back the center and have it look at least somewhat normal tonality from the center outwards, if I can get the dodging right. I might make a dodging mask by shooting a sheet of film in the pinhole camera pointed at a white wall, and sandwich the resulting 'center filter' with the negative at printing time. I'm still not sure if I should use the Rayleigh formula without modification or if I should make the hole somewhat bigger. Making it bigger would seem to help corner sharpness at the expense of center sharpness, at least in theory.