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The cost to dynamic range would be pretty high
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For me it's not the cost of the DR, it's that you lose so much of your already restrictive full well capacity which in turn restricts your exposure time. At 120 gain, you lose over 2/3rds, dropping to ~4k.
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Offset appears to be related to the black level and should not be zero.
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Never moved mine off the default.
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Temperature is a personal choice based on the conditions of the night.
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This is true. The 183 seems to have better cooling than the 294 so perhaps you won't have a problem getting down to -10 in summer. Just remember if you change the temp (or gain, exposure length, etc) you will need a new set of darks.
As I said previously, I'm not overly concerned with thermal noise as by far most noise will come from light pollution. Unless you get away from light pollution to good dark skies, worrying about pushing the temps down too much isn't needed if it's only a small percentage of the overall noise.
Here's the lecture by Robin Glover discussing DSO imaging with a CMOS camera - you might find it interesting.
https://www.youtube.com/watch?v=3RH93UvP358
Can't help with the white balance issue, it's mono for me.
Hope you're enjoying your learning experience. Cheers,
Mark