My main reason is I have a small setting position area. I have a sofa that has three seats and I am mainly in the far let one. I have the surround speakers on either side of the sofa on stands.
I do go through the angle measurements. When you say you run it 3 or four times, are you running the entire calibration that many times? What are you looking at to determine the best one? Right now, I don't have a sound meter, but will get one.