A new idea (just a test video, audio/video not perfect):
http://www.speedyshare.com/gRpvV/test3.mp4
I have moved the 'This had better work!' scene and combined it with a later scene of Tarkin and Vader
It actually looks quite ok, what do you think? How I see it now, Tarkin has doubts about Vader's tracking device idea, but we are now already orbiting the planet and Vader calmly (and over confidently) rejects the worries, as if he knew all along it was going to work...