Wow Dave, hard to pick a favourite out of that buch, they are all great.
Might be worth some more playing with gradient removal as per Bert, this would really make them shine!
It always amazes me looking at whole sky panoramas in this digital age and how releatively easy they are to do now. Back in my early astrophotography days the only way to appreciate such expanses of sky required multiple frames throughout a night then film developing and finally mozaicing prints together
...that was the only way really, unless you had a multi $1000 fisheye lens and these distorted the scene too much and couldn't be distorted back again in software
Nice work
Mike