24x24 km landscape from DEM and aerial photos

I’m doing some tests on building large landscapes from DEM and aerial photos thru World Machine. This landscape is 24x24 km and tiled 4x4 - 4k.

I have the following problems:
It’s some small borders around the textures in each tile, can it be the blend across tiles in World Machine?

I have tried to turn off LOD on tiles with steep mountains but I can’t control it from doing Lod’s

My foliage doesn’t load the LOD’s correct either.
Fixed this problem by turning off texture streaming

Sorry about the links for images but i got some error uploading