Hi mate I feel your pain. The last few times I've been imaging I'd have the camera running at iso 200! Any more and it was just pointless. BackyardEOS had my sensor temp running in the mid 40s :-(
As I understand there's exactly the same amount of photons hitting the chip, regardless of the iso, so I just take a few more subs and just stretch the stacked result a bit more than usual.
Cheers
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