Well, didn't know you had REW up and running, much better than a MultEQ app graph.
Your response doesn't look that bad at all...at least nothing to explain why you are getting the "deep rumbles" without the mid-bass. You do have a -10dB drop from the low bass (15Hz-50Hz) to the mid-bass (60Hz-100Hz) and a pretty good null at 57Hz, this may be contributing to your impressions, but overall it shouldn't sound that bad. Was this measurement taken from the MLP?
Have you tried moving around the room during bass heavy scenes to see if the bass sounds (or measures) better in other parts of the room?
Your AVR is compatible with the MultEQ app, you should really check it out. It offers you a whole 'nother rabbit hole to explore.
If you crave hands-on control of your Audyssey MultEQ room correction calibrations, and own a compatible Denon or Marantz AV receiver, you are in luck. Today, Denon and Marantz launched the MultEQ Editor app —for select recent AVRs—that lets users tweak, refine, and otherwise customize...