yeah, already split up. that was the suggestion i recieved first time round, however it wouldn't help increase the accuracy of the tileset
come to think of it, the problem tiles i have are with symetrical patterns, take the large lttp tree for example, if you split it in half, each side is a mirror image, and because of that, each mirrored piece matches up with its counterpart
a method i've been trying to develop, is one where it filters out distinctive lines which i figure i could use somehow.