I think in the original grade the shadows seem to have a touch of blue introduced into them, did you try that? Your second node structure looks a lot like mine, sometimes I wonder if for certain shots is such a structure too simple? Am I missing details? This is a problem I relate to.
Also can anyone explain to me the key difference between Layer nodes and parallel nodes? Maybe @Gioacchino Gargiuloyou can explain for me why you structured in that way and reasoning?