MY 'B' plate that I used on the top always had all the die cut marks on it and bowed something fierce. Then it hit me. Use the 'C' plate on top...and let me tell you this was the best thing that I ever did. That 'C' plate being thicker does not bow and it does not get any cuts in it!!!! Here's my sandwich NOW 'B' plate with tons of cut marks, paper right side up, die (which ever maker) with cut side down, 'C' plate and turn the handle.
If you do not like the cut marks on the back side of your die cut then just place a piece of plain copy paper right on top of the 'B' plate. I save all paper that comes through on the fax machine and cut it into quarters for just that purpose...o, and to take notes or messages! Recycling!!!!!
The wax paper looks like a great idea...so many times those dies just don't want to part with the paper!!! Thank you for that hint.....