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Hey graham, you are one little hive of activity down there!
You don't have to have the camera on the scope to take your darks. It is a good idea to take them at the same time as your lights -especially with a DSLR to get similar temps, but I often do them when I am packing up. I just take the camera off the scope and put the little canon cover over the bayonet mount and set it clicking away while I get everything packed up.
The ones that really matter to leave the camera on the scope (and in the same orientation / optical setup as your light frames) are your flats.
I find that my sensor will be about 10 degrees above ambient most of the time, so your high temps and noise are probably due to having the camera swaddled up.
Cheers, Adam
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