One of the added features of the Mk VII is the fine tune weight at the end of the arm. It is on a shaft that is inserted into the end of the arm behind the counterweights and has a smaller weight that is threaded onto the shaft for fine tuning of the VTF.
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You could easily be hearing the difference betwee broken-in wire vs. "cold" wire. In a high resolution system, especially with a cartridge that has extended frequency response, you'll hear quite a bit of improvement.
Rather than answer the question "can .3mv ever break in a tonearm wire?", I've decided to run burn-in signals through all Triplanars I deliver. I fear that otherwise, this fine arm will not be heard to its true potential, or at a minimum, only after some 75 to 150 record sides.
I go into a bit of discussion about this in the following forum post, along with some sample ideas for the do-it-yourselfer: http://www.galibierdesign.com//phpbb/viewtopic.php?f=6&t=80.
Oh yes, the fine tune weight is a late addition to what constitutes the Mark VII. This feature is retro-fittable to earlier Mark VII arms, and is highly recommended. Contact your dealer for the replacement counterweight stub. The arm stub screws into the rear of the tonearm assembly (no tools required).
Thom @ Galibier