Hi guys, I am back from overseas. Just an update: the issue has been resolved. All it took was moving the fronts further out and placing backs to the sides from their behind position (furniture needed to be re-arranged for that). Also measuring everything up to an inch and placing all speakers in perfect symmetry to the listening position and room boundaries. Now it all sounds clear and defined, with very good soundstage and no more phase messiness.
I also again did the bass crawl test and found that the best position for low bass (at and below 20 Hz) would be to position my subs in the room closet. Only then that infrasonic bass that has been missing would be heard (rather felt like pressure on the eardrums). But it would not be good for the low and mid bass found in music that much, so the subs get to stay where they are.
