Well without digging too deep, right off the top it looks like your are not running the 0.3 version, so I would maybe start there. From the web page it looks like that DAC does 16/44 and 16/48. Generally I dont think 16/44 is a problem, but as you move up thats whenthe noise starts kicking in more and more.
Maybe look at the link for the Schiit MODI DAC and try that, is a suggestion.