I agree with Bokonon on all points, IF the judging will be to BJCP or AHA standards. Since oak is not in style for a Robust Porter, only enter it if the oak is barely there.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk