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Maybe try individually stretching RGB to their own merits... I usually find that with certain targets, some channels have much better data than other channels.. This way you can stretch the good channels to their potential without introducing artefacts and noise in the lower quality channels..
When gaussian bluring, use the magic wand tool (turn off "contiginous") and select a star. This should select all the stars within the pre-detirmined colour range.. Then in the top menu, click select, modify, expand and expand the selection by 2px. then click select, inverse to invert the selection. that way, everything is selected except the stars. After that, click select, modify, feather. and feather the selection by 1 or 2px. Then apply your blur.. This way you will blur down everything except the stars... That should reduce the bloat in the stars, whilst still affecting the rest of the image how you see fit.
Hope this helps mate.
Alex.
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