Gosh, darkness AND glare! Tough combo.
Yes, I'll be able to help to a degree, at least. But of course we must never do any Photoshop work until the raw processing is done, so go ahead and do that now, then post again.
This is the latest news I've seen: https://www.diyphotography.net/dxo-acquires-nik-collection-google-plans-develop/
But for now, you're probably in limbo. If Google have stopped updating it, but DxO haven't yet begun to do so ...
Easy enough to add some "rays". Add a white Solid Color layer above the gradient layer, and clip it thereto. Then invert the mask. Then with a very low opacity white brush, paint some strokes outwards from the middle of the "sun".
Can you clarify - are these the varying values you've had to use to get an exact print match each time?
Remember that numbers by themselves are meaningless - only the print comparison matters.