What is your source? The jitter of the source is usually more important than the DAC.
If you are using a transport, then this is probably the weak point. Reclocking with a good resampler like the Synchro-Mesh can make a huge difference, assuming that the DAC does not resist the reclocking.
Jitter from a typical transport:
https://www.audiocircle.com/index.php?topic=154408.0
Steve N.
Empirical Audio