I recently upgraded the GradX plug-in to CS4 (64bit ver.)...screams along. The trick with GradX is to carefully lasso the features and feather like crazy. If it alters the extend object too much duplicate the original first and introduce it again (after GradX has been run on the other layer) as lighten mode and mask. By the looks of your image, CCDStack's flatten background tool probably would have done a reasonable job.
Yes, the quest to produce excellent images is an ongoing process...I've got a few images that will never see public eye until I can work the data adequately. Can always go back and collect more to improve on the result. I simply don't post if I'm not personally happy with the result. They probably look ok to someone else, but thats not the point...
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