ZBrushCentral

Blemishes/noise in Cavity map

Hi, after sliding the sliders for hours all i get ist this result of aperfect cavty map:

Untitled-1.jpg

of course its a mess …the mesh is smooth an I get all this noise in the places where I would expext a smooth gradient.
As far as I know there are 3 sliders that determine the quality of the cavty map…or are there other settings that could effect the quality?