Eddy,

Perhaps you are just seeing the limits of resolution obtainable with only 256 levels of displacement.

In the attached image, from an image I used in another discussion on displacement, I rendered a face entirely based on displacement - the one on the left is 8 bits - the one on the right is 9.58 bits. (Don't worry what that means) The point is, even just a little more bits per pixel can make a big difference.

Are you using P7? Perhaps P7 can let you use one of those newer file formats that hold 16 bits. And perhaps ZBrush can export 16-bit displacement?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)