I too have been on the search for the so-far-still-elusive low-frequency response combined with the appropriate ability to "punch".
Seems that if a particular driver is good at one end of the spectrum, it gives up the other. Getting a balance is a combination of the loading, the specifics of the driver and the crossover. The crossover is an important consideration in the mix, too.

Room suck-out could be a culprit, but if you had punch in the first place, it is unlikely that it would be removed completely. My opinion is that it is the particular driver/loading/crossover combination.

No clean answers to this one.

DM

I assume you've already tried this, but, just in case, have you tried reversing the phase of your subwoofer? If the overlap region is near 80 Hz, and if the two are out of phase, there may be a cancelation in this region.

Dave

These normally describe an emphasis in the upper-bass (~80-160 Hz) like you get with a Karlson K15 or pro-sound 'sub' or bass-horn.

GM

Hmm, 'floor bounce' historically has been used to describe the interference of this standing wave's reflection to the speaker's direct radiation at the listening position, so you normally have two notches from it, though when measuring on-axis at 1 m the two typically sum to a single deeper, broader one.

Standing waves are 1/2 WL issues, so ~1130/2/4 = ~141 Hz.

GM