I use this plugin all the time and this is how I usually go about it:
1. Pull the bass control knob until you have about -4db of tightness.
2. Select the Auto Punch button (this automatically adds level back lost from bass control).
3. Then, add extra lowend punch, about 2db.
4. After this, turn on the Sonic Enhancer in the middle to the brightest setting.
The first mode clears out any low-end noise, while the second mode shapes the sound more intensely, enhancing the overall sound.
5. Then, listen to the tighter low-end before and after…
Headphones work best for this one!