OK, I'll keep this short - I don't know if the bybee biwire's were the final "piece" of the puzzle or not, but they have transformed the sound of my system. So much so that I've had to pull out the mullard and Siemens tubes I was using before, and I now have back in the Electroharmonix. Where the mullards now sound too soft and laid back, the Siemens sound fat in the bass and thin in the mids, the EH tubes sound simply spectacular. Hell, the whole system sounds spectacular. The "drive" is back (very high toe tapping factor), but it's still super smooth sounding (Holly Cole's voice did not have nearly as much "grit" in it as I am used to). Microdynamics in the midrange are making me grin ear to ear.
Just wanted to give props to wayne on this cool little jumper, but the whole system is just working together so nicely now, so props to Brian at VMPS for such killer speakers, and to Frank at AVA for such killer electronics. And of course (to come full circle) more props to Wayne for such a great DAC, power filter, and cabling. Time to listen to more tunes - l8r.