It appears that your room amplifies 50Hz: 1125ft/s divided by (2x11ft) - not a bad thing, but it will also amplify 100Hz. I looked at my Johns Manville 2" high density fiberglass panels absorption data and they start damping at about 100Hz. To effectively damp 100Hz in the room you would most likely need 4" panels. Have you tried to rotate sub 90deg to project along the longer wall. Does it change anything? It is also possible that you have resonance issues or need bass traps. My panels are not installed yet but just scanning frequency response with microphone shows small hump at 40Hz and large one around 80Hz.
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Interesting....hadn't thought of or tried rotating and fire along the long wall vs aiming towards listening position....I'll give that a try. I am using a combination of 6" and 4" GIK Absorption panels on side walls at first and second reflective positions as well as bass traps in each corner. I'm also using their bass "soffits" on their sides along the rear wall baseboards under two 6" x 48" x 24" panels behind listening seat....seems like plenty of absorption going on.
Wondering if its a Verve thing as it occurs slightly in simple Red Book format on Live in Paris track 'S Wonderful.
On 196hz Hi Res download of Turn up the Quiet, track I'm Coffessin it occurs slightly right at the beginning and on Moonglow at approx the 30 second mark it kicks in very strong.
It baffles me because on Diana Kralls Girl in the Other Room DSD track Temptation, it has a relatively high amount of bass and no issue. If you are familiar with Patricia Barbers album Modern Cool or Holy Cole's album Romantically Helpless track One Trick Pony, both albums the sound engineers obviously made the bass very prominent yet I have no issues...weird!
Fortunately the REL's have a remote volume control so I can turn down the output on albums that it effects without much effort. Just seems odd.
The Loudspeaker Calculator here http://www.hunecke.de/en/calculators/loudspeakers.html may offer some assistance
For some background on subs and their operation see http://www.ielogical.com/Audio/SubTerrBlues.php/
For just setup suggestions see http://www.ielogical.com/Audio/SubTerrBlues.php/#Setup