Thanks for the comment Jeremy. I had already noticed that the area was too bright and had darkened it down a touch when I was "soft proofing" the final print.
Guido it is not really the software or the printer that is giving me problems it is trying to get the luminosity of the screen onto a paper print or at least getting as much of it as I can onto paper. It is not blocking blacks or blowing highlights it is preserving the mood of this delicate image. My usual mono style is high contrast drama and I can see what the print will look like from the screen with a fair degree of accuracy.
I use an Epson R2880 with a continuous Ink System printing using QTR, a mono only RIP. I produce my own paper profiles that produce both deeper black than ABW mode on the Epson and are more neutral.
I am never going to call myself a printing expert on a LULA forum where real experts lurk but I am not a beginner.
Similarly I have been using Photoshop since the early 90's although I am very aware that their are lots of areas that I have only a vague idea how to use to best effect.
I am always willing to learn and any hints will be explored.
Ken