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Looks good. Nice and crisp and colourful. Not sure why the core is blown out unless you have over stretched and then compensated with the black point. I have taken a few DSLR refractor Orion shots of one or two minute subs stacked in DSS and then edited in PS at 400iso without quite that much core. I tend to stack camera raw files in DSS and then save export adjustments with just a minimum 15% stretch to be able to see the result to 16bit tif. After that just a little little more stretch and black/ contrast and noise reduction in PS or levels with the right colour space.
Or stretch in another program like CCD prior to PS as PS will not always happily stretch a 16bit tif. If only DSS would output a camera Raw file.
Perhaps your flats or bias shots have gone wrong so you could try without them. Not sure you need bias on DSLR shots in DSS when you have dark substraction.
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