Search for "The Shrinking Technique" on YouTube.. it explains how to convert a stretched map and then shrink it back to its original size, giving the contours more definition than a standard conversion! This will mean a bigger map file however
the scale of the map is too large i think.You can send me an email, i will explain how to save space on your conv file.
And, Try to change the ground texture ?
Sorry, its roman.plagnol@free.fr