First post, so please forgive me if I mess up.
Below is a picture of ‘Jane’ photographed with studio flash, along with the associated XMP file.
After some experimentation with Darktable I found that I could produce reasonable images by disabling the base curve and replacing this with a simple S curve using the Tone Curve module.
I do however suspect that I am totally misunderstanding Darktable. I am sure there are ways of producing better images but I have spent hours experimenting with Filmic and Filmic RGB without success.
If anybody could point me in the right direction I would be extremely grateful.