With a big thanks to Paul Haese's suggestion and Ken Crawford's online tutorials!
Here is my redux of my M1 Crab Nebula using new tricks from Ken's tutorials. AMAZING difference, especially in the full size images I have here.
Going back redoing all my old data. Incredible how much I can now bring out, and increase DOF etc. Still a few hot pixels I missed (D'OH!).
Higher res:
http://www.astrobin.com/full/31782/?mod=none