Do you mask off the paper when you do this to keep everything outside the image area white? If so do you also mask the edges of the negative so the black line doesn't show?
i sometimes just have the paper go black and to get
the clean thin edge/line of the negative. i have also made
a "window" to print through to get a white edge and a black edge ...
i don't trim and drymount, ever ...
i cut a window and overmat and use those tiny archival clean negative
corners to hold the print down underneath.
i never print full bleed or almost no "buffer" around the print's edge and the edge
of the paper. even if i have the mat crop into the print a tiny bit, the last thing
i ever want is to have too little of an edge, and the corners i use to hold the print down
become visible in the window.