Interesting question and I know I have lots to learn about CNC machining. Based on years of experience using a router you would be better using a down cut spiral twin flute cutter on birch ply as this will give less tear-out, used with a manual feed rate of around 2Mtr per min taking around 1-1.5mm per pass so a feed of around 2.5Mtr sounds about right on a CNC machine to me. BTW what make of router / wattage did you burn out?
Mike :)