What is this plot showing exactly? I’m not exactly clear on what issue you’re trying to address. Is this about the grading behavior or something else?
This seems like a weird chain of transforms. Again, I’m not sure exactly what you are trying to rectify. Is it just that the sRGB curve is too contrasty for your liking? Is it the grading behavior? Is it something else? And you grading in between the 709 and sRGB transforms depicted in your processing chain?