Vectric Customer

I need to set up a drag knife (first use) for cutting 3.175mm foamcore.
I see how to define the tool path as a drag knife gadget.
My blade offset can be changed as needed from .15mm to about 5mm.
Need help setting up the "dummy end mill".
Need help with field entries for Diameter and Stepover + any notes on experience cutting foamcore and corrugated cardboard.

Stepover doesn't matter. Diameter doesn't really matter either as the gadget uses a hardcoded value. The feed and plunge rates are important though.