I see what you mean. My only idea is to wonder whether there's a way to apply a feathered darkening around the edge. I don't know if that makes sense, but I'm talking about fading the edges of the outline to black gradually.

That, or you could start with the other shot of the Taintive IV from that position, where they are approaching Coruscant rather than flying through the atmosphere. It still might have the same problem toward the end of the shot, though.

If it doesn't work, no one can say you didn't try.