Well then you should also be considering the pillows behind the head...
I think the "secret weapon" for room treatments is those wall hangings (sort of a blanket that made it big) you see with either native art, wildlife scenes or Elvis. They hang 1/2" to 1" off the wall so you get some really effective dampening, and if you let your wife pick the wall hangings the WAF is almost guaranteed.
I don't have another 3 days to load the MOAP and look at your room decor again but I imagine you could put something on the back wall. Right side wall wasn't a problem (seems to be an opening at the first reflection point) and I don't remember about the left wall.
A BFD should be able to bulldoze some of your response peaks although as you correctly observe that will only give you flat response in one or two spots. Then again, as long as you are sitting in that spot nobody else is gonna care
