Acrobat has a great feature - to make a Snippets to make a different preflight profiles.
Furthermore, you can (theoretically) convert PDFs graphics from profile to another.
I made a profile to convert from U.S. Web Coated (SWOP) v2 to ISO Newspaper 26v4, which have a colors limit of 240%.
I started it on of my documents, when process was finished, I checked raster images in my PDF, and I found a paint excess.
At the same time, conversion to Grayscale is d well.

Could anybody help to resolve this bug (or my limited knowlege :)

Thank you!