Whip, I leave Panorama turned off. For Center Width, I do think it's better to have some of the center channel material played by the mains, and the default(3 in most receivers) seems to be about right in giving a smooth distribution. For Dimension, in theory this should be adjusted for each source, depending on how much ambience is in the mix. Generally I leave it at one step below the default(usually 3)at 2 to send a bit more to the surrounds.

Incidentally, how was the Mahler 4th Sunday? I assume you heard the Missoula Symphony at the university.
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Enjoy the music, not the equipment.