Hey now,
Just took a quick look and it would appear that the crossover is at 80 giving you a 6db per octave slope.
If your recording is too rumbly you might try to set it at 60 rolling off 6db which crossesover at 120.
Heck, roll off 12 db at these settings and you're darn close to the Thompson/Butterworth slope.
Nice lookin plug. I usually use the Waves Rennaisance eq's.
You are on the right track.