Thanks Jo, hope you get to use yours soon.
Thank you Peter for your comments. After a few minutes thought I agreed with you. It was not all a jpeg compression problem more a problem with me naively stretching the contrast far too much. I went back to my data, this time gathering and applying some darks, reprocessed, and I believe the result is far better. Although, not nearly as impressive as your image. Your image contains fine detail and impressive subtle contrast far beyond mine.
My results here:
https://dl.dropboxusercontent.com/u/...%20revised.jpg
Thank you for taking the time to comment.
Best regards,
Mark