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Greg, I've captured a nice dark library at -5, -10, -15, and -20 deg C with 50 x 60 min subs at 1x1 binning with overscan. Based on my overscan test data, scaling darks down works better - and I shoot 60 min subs for NB. The temperatures covers the ranges I actively use (yes - I would love FLI's superior cooling). This should cover my imaging needs (LRGB & NB) for the next few months.
Like Rick, I'm also trying to take an evidence-based approach with my imaging process. Good calibration results in better SNR with my data as well. I've also discovered that performing overscan reduces my empirically measured read noise by 1-2%. I'm very much in favour of following the "anything that gives me measurable SNR improvement without extra dark sky time = good" approach.
I think an AO unit will definitely benefit your imaging on the CDK17. Finding a bright guide star won't be an issue on a 17-inch scope!
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