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i suggest giving Astropixelprocessor a try (free 30day trial), far superior to dss and works well with whatever subs you have to throw at it. doubling the time is introducing noise, halving iso as well doesnt mean zero noise. there are different type of noise at play which are not noticable for regular photography (since you're going off the exposure triangle) so the more subs you throw at the stackthe more Signal is gathered, true, but also the more Noise is gathered too. So if you decreasing SNR in the stack the less you can stretch the data. Make sure to take darks, flats and bias shots too with each set of lights so each set of lights can be preprocessed best to increase SNR in that set and therefore in the overall stack. If you didn't you can try doing those tonight under similar conditions and same camera settings. its not ideal but it should help. I dont think you've wasted time, maybe just your preprocessing needs improvement. if you give APP a try I find its default settings produce a stretched result not far from the best i can achieve in Pixinsight, so if APP gives you pretty much identical to your dss result then youve probably done the best possible with those subs and maybe look to your subs to solve the problem. All subs.
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