My findings were similar. SS amp on the T1 is bright and doesn't pair well. I think the Magni doesn't pair well for the same reason as that it's a slightly bright amp as well. It worked out great when I had it setup : T1(Dac, Orange Globe tube) line out >> Objective2. The highs sparkled and weren't even close to being sibilant, mids were warm and slightly forward a bit. Bass hit perfectly for me, had impact and quantity was there if the song called for it. This is of course all YMMV since we all hear differently but it worked out great to my ears. I still run the T1 as the dac but upgraded to a Darkvoice 336 as an amp.
The 336 is an upgrade from the O2?
What do you prefer in the 336 over the O2?