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Too aggressively stretching the high range of the histogram can result in bloated and colourless stars.. You could stretch the lower end of the data whilst trying to maintain star colour in the image, or you could open the image twice, stretch one image to get the desired image brightness in your target, then copy the stars out of the unprocessed image, layer them in on top of the processed image stretch them a little bit to brighten them up a bit, boost the saturation a little bit then adjust that layers opacity to taste..
If the stars are all white in your unprocessed image, then try taking some shorter exposures to record the star colours, then using the same method I mentioned above, layer the shorter exposures stars onto the processed image and adjust to taste...
Cheers.. Good luck
Alex.
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