I thought I saw your ZROCK2 with a gold knob listed on the build list. Sorry you didn't get the one you want. I have ebony knobs on my ZBITs, ZROCK2 and Taboo Mk IV--I love the feel of the ebony, surprised me the first time I got one.
Looks as if you're having fun with the ZROCK2. I generally have mine about 1 o'clock on EQA and do a little adjusting here and there from there with cds that need attention. I use B rarely but when I need it it's a great option.
Right now no ZROCK2 in the path as I'm using headphones. . . .
PS: I know you know about breakin of Decware products. What surprised me about the Jupiter Type 2 copper foil caps is how their breakin was a steady increase in transparency. . . they sound good from the start and just become clearer and clearer, out of the way.