Some final enhancement can be made to the image by reducing the size of the brightest stars. They have been "bloated" by some of the processing. To reduce the size of the stars you select them with the "Magic Wand".

Set the "tolerance" to 100 and the "feather" to 1. Hold down the shift key and click on the brightest and biggest stars to select them. You will see a broken circle appear around the stars as they are selected. Be sure to click on the center of the star and not the black background or you will have to reset and start selecting again.

Now we apply the "edge erode" filter.

Once the "erode" filter is applied, the selected stars will be made smaller by a small amount. Repeated applications of the filter will reduce the stars more but be careful or they will not look natural. Only one application is used with this image.