Nandan,
Nice looking system.
I might ask if you are using Single Ended or Balanced from the DAC-10 to the AMPS?
I have tried with both, and the top-end volume doesn't seem to change[1]. It's loud, just not as much I would like for Rock, although it's fine for Jazz, and middling for Classical. In any case, I mostly appreciate that my system doesn't have that so-loud-the-neighbors-knock character, but I would like the option to have people tell me "it's too loud, could you turn it down please!"
To answer your question, I was using Balanced because with Unbalanced I cannot use the volume controls on the DAC-10H
[1] Tested with Sibelius, Gorecki, GnR & Dulce Pontes