You've got some great data there Bert!
My quick & dirty version merely shows that there is almost no place in this field devoid of neb so there is very little (if any) "black".
It looks harsher than Marc's but that's done to highlight the detail inherent in areas that would otherwise look a little flat. It depends how you want to present the image - full res or scaled down. Scale can dictate the amount of contrast you need to display for best effect. Scaled down you may want a softer look than what I've done to avoid the overcooked critique. I can tell you though, at full res, my additional contrast yields an image
rich in detail.
Cheers, Marcus