Looking at the full quality file, I think the issue is actually that the edges of the model fall off into darkness which doesn’t look right when placed in front of a bright explosion. It would probably be a good idea to use a 3d model so you could get some light bleed from the explosion on the ship model as it passes in front of it. Another option would be to put some blur on the physical model as it passes the explosion and/or more aggressively matte out the edges during those frames.