My rear surround speakers

After a lot of trial and error i have settled on this setup because the back wall is too close to the seating position

Sounds enveloping, literally. No voids in the sound field!

UPDATE:

I watched Star Trek: Into Darkness at an IMAX theater and realized they also have rear wall mounted speakers in exactly the same position. Except that they were a lot louder than mine.
So I came back home, and bumped up my rear surrounds to +5 and it is now even better...just like the IMAX. I then put on Star Trek(2009) and Woo Hoo...what a blast!!!!!

Here is an imax theater...see the rear surround heights