Love the mosaic

Can I ask how you've managed to bring out the nebulosity without emphasising the thousands of stars?
I've attached an attempt I've been working on, but mine is a stack of 50mm F1.8 (@F4) shots on a Nikon D7000.
I think I used ISO1600 for most at around 90-150 secs each
I think DSS said there were 27000 stars on some of them, and I think it makes it look too busy.
I'd like to get a shot like yours, with less emphasis on the stars and more on the colour.
Any advice would be appreciated
Cheers
Bob