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Hi Shaun,
I just recently created a dark library with my newly purchased asi294mc. I also have amp glow and greyish background when stretched - completely normal. My darks were taken in pitch black conditions with lens cap on and look similar to yours. Individual darks have those random horizontal lines, but these should disappear when integrating a large number of darks (I use 50).
Below is an integration of fifty 5-minute darks at 121 gain and 30 offset at -10 degrees (I use 121 gain rather than 120 as some people have complained that the high dynamic range doesn't always kick in at 120 - not sure if that is true, but 121 is the safest option.) You can see that the horizontal bands should completely disappear over a large integration, but the amp glow and much of the noise should remain.
Regards,
Stéphane
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