The Interior Overcut for V-Grooves controls where the Blade Retractsfrom the Fallout (not the Matboard) on the Interior cuts of the Inside Cut of the V-Groove.
If Interior Overcut on the V-Groove Inside cuts Too Long, Decreasethe Interior Overcut on V-Grooves.
If Interior Overcut on the V-Groove Inside cuts Too Short, Increase the Interior Overcut on V-Grooves.