Try these mods and see what you think.
In PS curves;
Select the red channel, enter 98 for output and 124 for input
Select the green channel, enter 137 for output and 117 for input
Select the blue channel, enter 131 for output and 123 for input
You'll find the surrounding golden star field will pop and the reflection nebulosity will start to shine through. You may not liked it. it does tone down the Ha blend a little.
Good to hear you've making use of the history brush. Its pretty cool that you can paint with adjusted time. Helps to go over the highlights of images to bring out more features as you mention. You can do so much more though. Try painting with soft light and see what happens around dark dust lanes. They get quite colourful as the slowly dim. Powerful tool indeed.
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