Yikes! It looks like they're in the red channel.
This is a one-shot color camera, right? A DSLR?
Cosmetic Correction combined with Batch Preprocessing will help. I think you left off the rejection algorithm -- Winsorized Sigma Clipping is good.
Take a look at Harry's videos:
http://www.harrysastroshed.com/Calibration.html (among many other excellent and helpful ones)