The NoiseReduction:Wavelet filter is a strange and wonderful tool.
Not only is the interaction with Sharpen a complex one, the interaction with a following Contrast filter is also complex.
I found that there are multiple “sweet spots” for the Contrast, each spot only 0.1% wide, between settings that yield horrible big blotches.
It must be an unavoidable effect of the algorithms and the digitization, so I am not complaining.
I simply point it out so that others will know that when using this combination, fine-tuning upwards past the “That looks terrible!” point can sometimes yield good results.