John, if I'm not mistaking aren't you running a couple of EP600s placed mid-sidewall of your room?
I was home for the most of today and a played around with my single 600 quite a lot and I must say that the just aft of mid-sidewall placement in our 25'x14' room sounded extremely good ... I used the Rives test tone CD prior to moving the 600 but didn't manually graph or use the CD after moving it to the sidewall location. Prior to movement I did place the heavy beast in the listening position and walked/crawled around the room with the mains turned off, man I moved that 600 around so much today I thought I'd have a hernia but probably nothing more than due to time it ended up back in the right front corner. After a couple of more tries and tweaking I do believe the sub *may* end up mid-sidewall even though that isn't the ideal location for aesthetics ... but I have been informed that this is *my* room.
