A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)

I have this in test:
In the normal DDDAC design it is always connected to GND.

CCS negative PSU.JPG

With the jumper I can switch to GND or to -10V. Current stays almost the same, just a small adjustment to 40mV is needed.
It was advised by Zen Mod to give the JFET more 'headroom' in post 2621, 2568 and 2565 in this thread. There are more posts around that time.

Did someone actually implemented it and hear a big difference?