I just got my first dry mount press (Seal 200) and ran 3 12x16" prints through it for flattening at about 200 deg for one minute between two sheets of 2-ply mat board. They each had some serious potato chip waves on the edges, and these flattened out into small creases along the side. Since I'm new to pressing, can someone advise if there is a way to avoid this? In this case, it's not a big deal, as I have a generous border on these images. It could be a problem later, though. Thanks.