I no longer dry mount either, though I have a press, which I use only for flattening. I hinge with linen tape, and cut the overmatte to reveal a bit less than a centimeter of white border, beyond the image end. I sign the back of the print and the matte.
For flattening fiber paper, see the first sticky in the Film, Paper, & Chem forum, lots of info.
I'll look for info on flattening prints and forget about dry mounting.