Help with Martin Logan Aerius Speakers

Hello all...

My listening room is very well dimensioned... I'd say about 15 feet wide, 23 feet long, and 14 feet high. My ML Aerius's are about 3 feet from the back wall, and about 3.75 feet from the side walls. They are about 7.5 feet apart from each other, toed in about 1.5-2 inches toward the listening position (which is about 10 feet away).
Everything sounds great, imaging is very precise, and I'm pretty happy with the soundstage. My only (albeit slight) complaint is the bass... a little on the boomy, muddy side. I'm looking to "clean" up the bass a little, but I have a few questions...

(1) Is this just a weak point with the ML Aerius speakers?
(2) I opened up the back panel... will adding more "stuffing" tighten up the bass? I'm not too concerned with extension down in to the low 30hz region... more interested in a cleaner, tighter bass.
(3) Would adding vibration damping materials to the woofer enclosure help?

I've tried some feable attempts at room treatments (couch pillows and such placed in the corners), and it didn't help very much. Also, I've tried all sorts of different placements in the room... What I have right now is the best for imaging and soundstage, and, like I said, the bass issue is not THAT big a deal. BUT, I figured I might ask for some input... Thanks in advance!
Hello, I own an Ascent. At first, I experienced the same problem your having. The solution that works for me is to build traps out of egg crate foams and burlap fabric. The dimension that I used was the same dimension of the panel(ESL) for length, and about 5 inches more of the width of the panel, and 2 inches for thickness. The result on my system is that the bass becomes more defined and with "authority" even if the base control switch is set to -3 dB. Maybe you can try this, it's very cheap and hope that it works for you!
Have you tried moving the speakers further into the room? I have my SL3s about 6' in and they sound just fine