Playing around a little with the settings I obtained these results:
To leave Zmapper click anywhere out of the canvas area and you will have this:
Export the map as you did previously for the colour map.
Now we will create a displacement map which will be used later as a bump map. Open the Zplugin menu and open the multi-displacement section.
As you can see in the image, like for the color and normal maps, Max map size is important, and so is map quality (DpSubPix).
3DTotal
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After having chosen the settings that you prefer, click on export options. A window will pop up. In this window, again, choose the settings and close. Then, in the Zplugin menu, click on create all.