We developed a design that ate up very little material but does a very good job of showing exactly how any piece of material acts at various speeds and full power or you can change the power and run the different speeds for engrave and cutting, I then keep the piece as part of a reference set I can refer to. It has 100 speed and full power as the slowest cut and most of them I had to have a wet rag to stop them from burning up completely, but that burn is also a reference, The woods noted above did not burn at that lowest speed.
In thinking about it the plywood I had was your basic HD ply that was mostly pine, but if you had Baltic Birch the results would be very different.