While I dont use a dSLR from what you're saying it sounds like you processed all these 50 and 80 seconds images and combined them. What were the total number of images used to combine the final? And what is a Ha Modified camera? From what I've seen this is modified to boost Ha signal and still be a color camera? Anyway, after combining the images it sounds like you used the screen transfer function (STF) which does a decent job of a stretch but doesn't actually stretch the image, it's simply for viewing. Then using DBE for correcting any background vingyetting. At this point I would have used Photometric Color Calibration or some other means to correct the color balance and then take the image from linear to nonlinear (stretched) by using either Histogram Stretch or Masked Stretch. I usually use curves correction to boost contrast after using Masked Stretch. At this point you should have a fairly well balanced image. But a word of advice, pictures really help here and there are many ways to get to a finished image. My approach with my 12.5" RC and STL-11000M was taking 30, 60, 120, 300 , and 600 second images processed as 5 individual images and then the masters combined using High Dynamic Range Composition (HDRComposition). The resulting image gives you far better results covering from the very lowest signal to the very brightest.
I don't use Batch Preprocessing as I'm a bit of a control freak but primarily because I use a rotator and the last time I looked PI doesn't differentiate between E/W pier side images. I guess I could do all east side and then west but I'm old and like doing the image calibration, cosmetic correction, alignment, and image selection (culling) separately. I feel this gives me more control over the process. Not knocking those who use it, just isn't for me. But then with your camera don't you need to debayer the images and then combine?
-Steve
