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Hi Gavin,
I saw your noise issue on helix but I left it to others to comment. As for Sculptor, I have the same issue. I was expecting it though. I had some self imposed tracking issues so out of a planned 3-4 hr intergration, I got 1 1/2 hrs, pretty much the same as you. I know in my light polluted skies, anything upwards of magnitude 6, I need a good 500 subs ( mine are 22sec) to get anything with half decent SNR. Sculptor is in an easy spot and is up at a good time so my advice would be double the subs and see what happens.
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