I've had the same experience as S23chang. Moving the stereo speakers or even placing a video screen between them to accommodate Home Theater lets the stereo image fall apart. You seem to have some very nice two channel gear. Have you ever had your two channel setup, room, speaker placement, etc. evaluated? Once dialed in even minor changes will dramatically effect the stereo presentation.
I gave up and went an inexpensive HT setup in another room. The 5.1 audio (not HT) is another animal.
I gave up and went an inexpensive HT setup in another room. The 5.1 audio (not HT) is another animal.