Alan P, based on the graph posted in the OP, I'd check your sub distance settings in the AVR menu. In our case, Audyssey reports 26' when they're a measurement tape reading of 13' and 12 respectively. The main listening position is a bit asymmetrical because the main listening position is a bit skewed to one side of the center line. Changing the distance setting to 13' made a world of positive difference. I haven't measured the difference as I'm taking a two week sabbatical from room measurements but simply changing the distance to the measured distance made a hugely and very noticeable, positive change. When I come out of my self-imposed sabbatical, I'll measure the room and graph the change that was made.
The rule of thumb I've read, there's a listening room reading vs a tape measure room reading. Measure and set your sub distances according to what the tape measure tells you and if an improvement, you're good as the distance setting is not a set in stone type of setting. And if things seem worse, go with the Audyssey recommendation.
As to placement of the subs, if you haven't found out already, one will be surprised how much moving a sub a few feet, to the left or right, backwards or forward a foot or two will make in overall subwoofer performance. I also use all three controls to make parametric changes; volume, phase and frequency. And to be encouraging, in my opinion, nothing is sacred (set in stone) regarding subwoofer settings and placement. It's all about what works. I also find one has to do the best they can regarding subwoofer placement based on WAF, room placement, furniture arrangement and reflective surfaces that one can't do anything about (oh hell no, I'm not filling my room with acoustical panels) as there's the ideal and there's the reality of the issues.
As a suggestion, remove all EQ'g efforts, set your sub the best one can regarding parametric settings and sub placement, then bring in EQ'g efforts.
-Edited by BeeMan458 - 2/1/13 at 10:33am