After gathering almost 10hrs on the cave nebula with my newly modified DSLR, I finally got around to integrating my subframes. As I've begun to process the image, I can't seem to find a DBE solution that I am pleased with. Ive linked images in Dropbox of my best attempt so far (STF left, DBE right), but despite my efforts, there is still a brightening effect on the dark nebulosity in the top left corner (indicated by the yellow highlight). I've tried ABE with various function degrees, the DBE symmetry feature, various different DBE configurations, and placing samples on a star aligned "APOD worthy" image of the cave to compare and optimize sample locations.
Can any of you who are more experienced with DBE help me figure out a solution to this? I've also included my image (.xisf) and the DBE (.xpsm) icon in the Dropbox folder. However, I will ask that you don't distribute my image data, but feel free to process it all you want
Thanks for your time and help in advance!