I would give your 6900 a chance to burn in over 100 hrs first, while the tonality does not change much after the first 40 or 50 hrs, they do tend to "open up" after 100hrs of burn-in in terms of soundstage and resolution. Also try different taps. I find on my 501 monoblocks the 8ohm tap is the more "musical" tap overall even though my speakers are rated at 4 ohms nominal.
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