I agree with the Cardas method which is where I put my speakers and did not even think about moving them after that, but do not have the link. Someone put the link in an old speaker post of mine about Maggie 1.6 speaker placement if you can find it.
I also like the TAS rule of thirds method. I think it is the best for integrating the bass with the rest of the sound but your speakers are really in the middle of the room with this method.
In my 22 x 13 room the speakers were 7.3 feet out in the room and 4.3 feet apart, which is the room measurements divided into thirds. The speakers really disappeared and the balance was great but I could not leave them there for long, just too intrusive.
I also like the TAS rule of thirds method. I think it is the best for integrating the bass with the rest of the sound but your speakers are really in the middle of the room with this method.
In my 22 x 13 room the speakers were 7.3 feet out in the room and 4.3 feet apart, which is the room measurements divided into thirds. The speakers really disappeared and the balance was great but I could not leave them there for long, just too intrusive.