My system is as follows: 777ES -> AQ Lapis III 1m -> Audible Illusings M3-A most recent version -> Siver Audio Hyacinth 3m -> Bel Canto EVo 200.2 monos -> AQ Sterling II 6' -> Sonus Faber Grand Piano HOME latest version (fantastic speakers).
Adding a second EVo 200.2 is a great idea. When you audition it with the one you have you will keep it.
I do not know if the passive EVS Ultimate Attenuators are the problem or not. I am pulling my hair out hoping that the brightness goes away in my system as I approach the much talked about 400 hours of break in. But no one seems to be willing to say what the 'sound' of the 777ES's terrible break in period is like, just that its 'terrible'.
Good luck and let us know if it is indeed the passive preamplification.