'fraid i'd have to agree. besides the Phoenix, i've also tried with a few other amps & concluded that T1 and SS amps arent a good match (that ive heard so far). even the custom EL84/12ax7 SE amp (which drives the HD800 decently) cant tame the T1s very active highs.
luckily the Audio Space 300b amp i just got works incredible (to my ears ofcos) with the T1 (& the Senns as well). indeed im listening to some Micheal Buble right now & it sounds amazing....no sibilance no harshness yet super detailed with tight delineated bass.
fwiw, i'll be attending the Calgary meet at UofC on Sept 8th & will be dragging along the 300b amp so any local cowtown headfiers can attend & hear for themselves how crazy good the T1 can sound!
Unfortunately, I only tried T1 with Phoenix (in SE mode) -> boring, Dark Star -> Harsh treble, then I didn't care to try with further amps.
Note: all with different source and songs, so YMMV.
Now this one, the source is just iPhone, and I was impressed with dynamic, bass and treble cleanness.