[mkgmap-dev] How to avoid coarse maps

Hi! I am trying to make a map based on default style with levels = 0:24, 1:22, 2:20, 3:18 At zoom level 0 the map looks ok: http://files.mkgmap.org.uk/download/144/level0.JPG But at zoom level 1 and up it is very coarse: <http://files.mkgmap.org.uk/download/145/level1.JPG> http://files.mkgmap.org.uk/download/145/level1.JPG Optimization options --reduce-point-density=NUM --reduce-point-density-polygon=NUM seem to have no influence with NUM values between 0 and 10. How can I control the smoothness of the map?