Any knife will bite better at an angle due to the properties of wood.
I don't have a Rodent 9, so I can't add anything on this particular knife. I can say that in order to maximize many of the swamp rat knives full potential, the stock edge often needs to be altered. I usually grind the secondary bevel to a lower angle, and this does increase performance. Sometimes I remove the coating, and sometimes I even grind the primary bevel thinner. I understand why they grind them the way they do as while steel can be removed, it cannot be added. This is my experience, and as always, YMMV.