Thanks for your comments Dave. You should have seen the room before I tidied it up with Gaffer tape everywhere and the stands supported on Wal-Mart cutting board to make moving the speakers easier for my ageing back and to keep peace with my wife for making many marks in the carpet!
I never really thought I had a problem with the windows but I was prepared to hang heavy curtains if necessary. However, I thought I would try out the Cathedral Sound Room Dampening panels but I really did not hear any real improvement or degradation of the sound in my room so I left them in place.
BTW, I already had to sell my burial plot to buy the 28B’s. Cremation is for me now and my ashes to be sprinkled on my cedar hedge that I have carefully nurtured for the last four years. 
Dave, I was most interested in your review of the Axiom M80 V3 speakers particularly as you are used to some high quality sound from your MB2i speakers. I will be interested to hear how you find the Bryston Model T loudspeakers although I expect to be at TAVES and listen to them myself.
You didn't have to clean up your room just for us! Anyway, I for one want to keep the image of you as an audiophile neat freak.
Moving heavy speakers around is something that has plagued me. I had my giant MB2is on stands, filled with sand, and on spikes. They were killers to move. Axiom told me that they've tested their speakers with and without spikes and found that there is no tested difference. Seeking relief from the difficulty of moving spiked speakers, I took the spikes off my M80s, and I truly hear no difference. This is not an invitation to a forum war about the merits of spiking. I'm only saying with these particular speakers, and for me, no spikes works. I'm happy, and, more importantly, my hernia repair is happy.
I'm not surprised that your dampening has not produced a difference you can hear. I have large bass traps in my corners, but hear no difference with or without them. I leave them because it is a place to put them.
I'm happy to see that you read my review of the M80s, but didn't take it as some readers did as a knock against users with different preferences or against PMC speakers. I still think the MB2is are great, and I once owned IB2s which I liked, but ended up liking the MB2s better. My move to the M80 represents a change - or rather a reversion - to a different preference I now have in audio: linearity, accuracy, and high resolution. Not everybody's cup of tea because some things can sound harsh with high resolution speakers, which was never the case with my PMC speakers. But this new preference is the main reason I'm buying the Model T.
But given your postmortem arrangements which I will now imitate, if it takes too long time for Bryston to produce the Model T, do you think I can find a dealer who will take my ashes in trade?
Dave
