Bump in shady areas

Hello,

how can I improve the bump?
Tried with bump mask and normal mask, bump channel and corona normal shader:
The problem: In shady zones the bump effect is almost washed out…It looks really not natural, as it would be another material there :(.
Does corona-bump only work in directly illuminated areas?
Please look at the example attached.

Thanks!

See, if Texture Sampling set to None fits you better.

Another option would be to emphasize surface structure by slightly multiplying bump map in with diffuse…

Thanks burnin, I´ll try it!