Yes I agree with critical listening with the Streamer after the Decware gear is broken in. It is possible that some of the analytical edginess could be from your current gear, and/or possibly the USB cable you use.... It will be cool to see what you hear with the Decware. I think it will up your audio pleasure immensely. The 6moons review DAC comparisons to yours are impressive indeed!

So I would say wait and see. The Zstage can definitely smooth edges, assist in nice harmonics, and modify the sound signature, the one tube being a very powerful voicing tool. And you can change the sound with power and IC cables too. But it is absolutely impossible for me to know how to compare your DAC to the ZDAC and Tranquility. I can say that neither have a brittle edge to me, and both do a very good job of the maker's interpretation of analog sound. They sound natural in my system, the Tranquility having an edge in inner and micro detail that offers an amazing ability to feel all the textures and nuance of the sounds of an instrument, and how the instrument sits in space. But the ZDAC has its pluses as well, being very defined in the midrange and bass, and carrying the emotion of the playing in a very good, and for me indescribable way.

If you get after the Zstage, I would be sure to call Steve before you order to be sure there are no issues similar to what Rivieraranch experienced  with the CSP and the Mini Torii.

I believe Cool Edit Pro v2.0 which is now called Adobe Audition will batch process WAV files from a CD at 44100 at 16 or 32 bit depth. It's been awhile since I've used it so I could be wrong...It'll also batch process WAV files into MP3 as well with several different levels of quality using the Fraunhofer codec.