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I think you've got it in 1 Mike. The unless the star is particularly red then, yes the long exposures saturate the stars.
You could try for a HDR process, but initially I'd suggest experimenting on the longest exposure you can go for and still maintain star colour and use that as your baseline for image capture. Of course if you are wanting to go for really faint stuff then you will most likely need to sacrifice your star colour for faint detail.
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