I'll throw in my two cents. I think everyone here would agree that trying to grade out a system at 50 hours is foolish. All new components, speakers, cables... need 2,3 or 4 times that much time to effectively burn in to produce their true sound. I run McIntosh gear with 805d3's and have zero brightness issues. As an example of my above statement, I just received a new Black Dragon USB cable yesterday
(for another system)
and just started burning it in today on my two channel system. This is the same USB cable I've been running for a couple of years and I love the sound. Well, immediately upon turning on the system with the new cable everything sounded thin (not bright) with no depth. It even affects the sound quality of the REL T7x subwoofer. If I didn't know (from past experience) things were going to drastically improve over the next 200 hours I'd be in panic mode myself. I'd recommend running in your system for a week or so 24/7 and then see where you are at. I'm sure it will be drastically better than where you are today. Good luck.