why i get the maps like so
with this stretches and distortion
Attachments
It is probably in your UV map. You can check that in ZBrush by going to Tool > Texture Map > New From UV Check. If you see any red in the resulting map, ZBrush does not like your UV’s. This is usually caused by UV islands touching the edges of the UV space. Make sure all your UV islands are inset from the edges a bit.