As the board is being cut, it tends to bow upwards slightly. I don’t have a vacuum table to prevent that, so I just hold it down a bit by hand when the shallow 1 mm cuts are being made. It might not even be important, but I still do it.
The white Adams foam board works great, but the brown FliteTest foam board is better.
After you cut, and build a couple times, you’ll see what works, and what doesn’t. Keep me posted. I’m interested in any tricks you learn as well.