Denoise for vfx compositing

Im a vfx artist using Nuke.
When I do any type of vfx work I first denoise the source clip, do my vfx and then reapply the grain with a node called DasGrain.
I usually use Neat Video for denoising.
But when I try to denoise with Topaz I get unwanted black levels in darker areas.
Any one using Topaz for denoise in the context with success?

Topaz can only process in RGB48Le. Every colorspace gets converted to that for processing. When I output to tiff or PNG, I don’t see any problems, but once I try converting those images back to a movie format, something happens to the blacks.

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