I agree about the reduced fatigue. It's the foremost reason I use crossfeed. Sometimes it enhances the holographic presentation of the recording. It does depend on the recording, and can even be unnoticeable. I'm not too bothered about the inaccuracies that crossfeed may introduce. It is minimal, and the 'coloured' presentations of my headphones offset accuracy by a larger degree.
Could you tell what crossfeed you use ?
I wanted to experiment with Audirvana and TB isone as an AU plugin.