Lowering jitter is always a good thing for digital. This is the main thing that impacts SQ. The only way to improve this is to mod the transport or add a Synchro-Mesh reclocker to the Oppo and a good DAC. The separate transport/DAC will allow you to get the lowest jitter. Here is the jitter from a typical Oppo:
https://www.audiocircle.com/index.php?topic=154408.0
8psec is very difficult to achieve, even with the clock inside the transport and using the analog outs.
Steve N.
Empirical Audio