I guess I don't have the gilded ears (or revealing enough system) to hear jitter. As much as I have obsessed over this, I have come to the conclusion if I cannot hear it (including long listening sessions), I won't worry about it.
There must be something else holding your system back if you don't hear the benefits of lower jitter. Active preamps are the usual culprit.
The uRendu is a good choice BTW, but I have gotten away from USB after designing 6 generations of it. Ethernet is easier to make stellar.
Steve N.
Empirical Audio