I would agree with Louis, on your results with Audyssey. You have spent a great deal of time in treating your room to get the proper acoustic results, so it is no surprise to me that you don't see any great results. Your effort and room is my example I use when talking to people about how outstanding results can be accomplished by a DIYer. Keep up the great work!
BTW, have you ever considered adding Bass Shakers (or tactile transducers) to your room to increase the perceived base response? Or do you achieve the desired level of base through your subs?