I'm not too familiar with Blender Nodes, but if possible, try to export the texture map as a .png. This will give you the UV map of the texture which is necessary for Feral Heart use.
As for the mesh, I'm not quite too sure why it wouldn't maintain the same properties while converting. It could be possible that you have too many vertices in the original blender mesh and DelEd does not recognize all of them. Perhaps try to merge some vertices together in blender and try re-converting.