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As noted, you can't gain match all the channels at AVR level. Speakers will have different sensitivity and positioning and will end up being calibrated with +/- dB offset during calibration. Are you saying that you can't perform calibration because it shows you maxed offset for Atmos?
If not that you are probably OK, although having large positive offset on some channels (compared to negative on others) could drive 3800H into some distortion for the overdriven channels under extreme circumstances.