Well starting over is part of the fun. I changed a few things and went back to a strictly 2 channel system. Changed the room (house) and am very happy once again. Only change on the horizon is to run proper power for the Krells. I'll run 2 dedicated 30amp lines and use the NEMA 5-30 twist locks to connect them in. I'll run dedicated lines for the EMM gear at the same time too.
I followed a similar path: changed from KCT to DCC2SE, and also used these with WP7s and a Krell amp. It was a major upgrade from the KCT to the DCC2SE. I sold the DCC2SE last year and have regret it ever since. Thinking about going back in that direction. Congrats on your new room and system.
Nice setup and room. We have similar components: WP7, Krell amp, EMM digital. I've also been looking at tube preamps. Your choices sound good. I recommend also listening to the Shindo pres. When I demoed one in my system, it added the right amount of body, without sounding tubey. Your mileage may vary.