Post Process Volume default Film Contrast setting .03

I’ve got a low light situation and the falloff to black is clamping. When I change the default setting in my PostProcessVolume from 0.03 to 0 my blacks get milky. Is there a way to keep the gradient to black smooth without using the default Film/Contrast values? The clamping isn’t obvious on my monitor so may be a resolution issue with the oculus rift cv1 HMD. any thoughts would be appreciated. thanks