I've been busy with REW lately..using it yesterday to find the best location for my single sub. I found it left of the fireplace as shown below. The couch spans 6' across so I took 3 measurements, at the center, 24" to right of center, and 24" left of center.
Here's just the bass response with no PEQ;
Today I took full frequency sweeps with various settings of YPAO. The results are not very good and I'm wondering if being too close to the backwall is the culrprit at play. The mic is only 19" from the back wall. Here are the results at 1/6 smoothing for each of the PEQ curves. Crossovers were set to 80 Hz
YPAO=Flat
YPAO=Natural
YPAO=Front (based on the Main capabilities)
YPAO=Off