I am trying to make some enlarged negatives using some FUJI med film I got for free, its a single emulsion blue base. I have tried it in a pinhole camera and it seems to work ok but when trying to enlarge a 4x5 neg the positive comes out very muddy and neg even worse? Could it be my developer? I am using D-23 3:1. Could I be just overexposing the hell out it?