Calibration? (From The Princess Bride) "I don't think that means what you think it means." In any case, you seem to have chosen some nice components within that price range and you're probably not going to better them without spending a lot more. Look into some good power conditioning. I prefer Audience, but there are others. I know - Do I have to spend more on my conditioner than my DAC? Yes, if you don't want to screw things up.
http://www.needledoctor.com/Audience-adeptResponse-aR2p-Power-Conditioner
http://www.needledoctor.com/Audience-adeptResponse-aR2p-Power-Conditioner