First of all, I can't be sure about anything I'll write further. My knowledge is based on slightly different terms.
The "Doc" article you have mentioned is about compensation circuit for different tape speeds, so it is not "one-breakpoint-suits-NAB".
I think in your case you should put 50 as Bass Pole, 500 as Bass Zero, 3150 as Treble Pole and "Ignore" at Treble Zero.