Nice review. I also think peter you will like the D7000 better with the SS amp. I use audioquest samba interconnects which are copper with great results. The T 1as I have also said sound good on the Matrix but better on the tube amp. My Matrix really tightens the bass and defined the sound stage and the amp will be used for them. Also keep in mind that low impedance cans can really be hard on the OTL amps and your tubes. I can play the SS amp loud without clipping it. I really only have to leave the setting at about 8-9 oclock to make them sing. Good luck and enjoy the Concerto.
I agree, with my MAD Ear+HD, the T1s sound more "organic", while on the Concerto, the bass is equally deep, but better defined. If the kids went to bed on time, I would have enough time to plug in the D7000s.
But with Grados....the MAD tube amp is my absolute favourite of all time (and I've A-B'd my RS1s with the Melos Gold and the Mapletree amps...and still came away liking the MAD amp...not by much, but enough). But I'm fairly sure that the Denons will be better on the Concerto as they do seem a better match for SS amps.