poita … YOU ARE THE MAN !!
It’s probably the crush (about a 3rd of the picture area is in zero’s! – here highlighted) that makes the previous scan look like no dark detail.
The brightened scan still has a large area crushed, but it’s all in the background now. Using a gentle curve on it, weighted down at the low end, produces a beautiful shot that keeps the detail (even if I don’t know how dark the shot is to be targeted).