I auditioned the Olive 0H4D and OH6D, at a local dealers in a good Krell and Kef Blade system. Un fortunately, I thought both were poor, flat, lacking dynamics and stage depth. I say unfortunately, because I wanted a one box streaming solution as well. I would say, stick to what you have got.
As a matter of interest, Kclone, have you ever compared your Mach 2 mini, with the basic cooking version, was there a real difference? I have not seen it said explicitly, but I get the impression that the consensus may be to spend more on the DAC, than modifying a computer source, better value for money?