I'll help again tomorrow- there is something wrong with your stacked image.
It really shouldn't look like that. It doesn't look like a stacked image at all.
I often take only 30 sec subs and my stacked image never looks like that - even when I only have 40 minutes of data. Post one of the subs straight from the camera with no processing.
The darks help reduce noise - but it won't affect the image like this.
What camera / telescope are you using?
What were your camera settings?
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