Ok guys i've been making some progress within zbrush, and i've decided to make a 2048*2048 uvsnapshot, hoping to get better results/detail, i've also amped the subpixels-value in z brush to about 2.
And i like the result, the only thing i'm not liking is that when i import the displacementmap it seems to come with his own additional bump-map, because of some minor pixelcolor-variations.
So if anyone knows how to avoid this it will be much appreciated over here