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Hi Carlton,
The best advice I can give you is to keep it simple and concentrate on one thing at a time. AP is not easy !
ISO 6400 will be grainy/noisy. Nothing you do in DSS will change that.
The image that DSS pumps out will tend to be very dark and grey ( lacking in colour ). This is normal. Then you move to processing the image. You'll find that when you open the image in your processing software, it will already be lighter.
Let's get back to your original data though. As has been discussed in your previous thread, use a bahtinov mask for focus. Secondly and probably more appropriate to this thread is the quality of the initial image. The only way you will be able to initially decrease initial noise is to get your ISO down. Every camera has a point of invariance. You can google that but the simple explanation is the most effective ISO balancing brightness verses noise. ( it's more complex than that but that's keeping it simple ) The compromise to reducing ISO is you aren't getting enough data which means you need to increase the length of your subs. Only way to do that on your Alt-az mount is to make a wedge to take care of feild rotation. Unfortunely, as you're finding, it all has a cascading effect. One thing effects another and so on.
17 subs, you will soon come to realise, is not nearly enough to deal with signal to noise ratio. All cameras are noisy in low light. Obviously some more than others and dedicated cooled AP cameras less than the others. The idea of stacking is to increase the signal to noise ratio. More subs is the simple key here.
You say in your thread title that you're struggling...... We all did / are. We are all here to help though. Lean on us and use us for help as much as you like. What you are already doing is far more than a lot of people ever do and that includes professional photographers. Most don't even attempt it because it's hard so give yourself a pat on the back for what you have already done. Also don't forget that what you have already taken a photo of is 1,300 light years away !
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