I’m working with filmic since rc1. Saw Aurelien’s videos and adopted a workflow he described there (same like @paperdigits).
It’s written in detail in the darktable 3.0 manual. An early PDF is here:
But to be honest, I’m not experienced enough to give advice regarding filmic besides this workflow. I still find myself trying ‘some sliders’ with descriptions that sound like they could help.
And my highlights loose contrast in so many situations…