Dave. If I understand correctly you are listening to the surrounds/rears by themselves. Why?? You are supposed to listen to the music not the speakers or just one component of the music.
Also, if you find the bass thin, why do you continue to use the Audissey settings?
Listen to all the speakers with the surrounds/rears crossed much lower.
Last. The surrounds are there to add depth to music and give it an immersive sound, not to add meat/oompf/kick to your bass. If you have an issue with the bass, you should be taking issue with your mains.
Mark and Fred have nailed it on all counts.
Surrounds are not for presenting bass. If you want bass from surrounds, go to a full range speaker.
Angle at which the QSx are placed is not how they were designed. Normal, flat surface placement with options for height or distance front to back along the sides.
That's about it for optimizing location.
A xover of 150Hz is ridiculously high unless you have main speakers the size of a baseball.
And yes, if you listen to the surrounds on their own, it does sound weird.
Lastly, forget about the notion that because your neighbor is a drummer he has a special ability to better discern sound. It is a fallacy. If anything his hearing is shot from playing drums.
I recommend you try some reading from Dr. Toole's book. It will clarify many questions if you are concerned about so many small details that may or may not mean anything at all.
