David,
I too struggle with the "optimum" setting, and flounder on hoping.
The "Brain" settings will have a Gain section, and I use 10%. Take a dark for sure, as it will help. Depending on the amount of stars in the section you are imaging, I use from 1 second through to about 5 seconds.
As for the rest (aggressiveness etc) you can at least try the default settings and work from there.
It is a great program, and more so due to its cost.
Gary
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