Hello: I only have a 5.1 set up. Depending on the type of speakers your running on your surrounds will determine the trim settings. Have you done a calabration with the radioshack SPL tool? When you do the test tones with the 990 you must have the volume set at 0 dbs or close to that. For my B&W's my settings are 0 for the fronts +3 dbs for the center and +4 dbs for my surrounds.
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New Shooter
990/7500
Dennon 1920 dvd/cd
B&W 603/LCR600/600(S)
Audioquest/Outlaw cables/Flat Wire
Velodyne(sub)
Mitsubishi DLP 52" 1080p
Direct TV HD / Belkin PF60
B-tec speaker mounts