What a coincidence, I captured the same LD (and also Star Wars and Empire). But I think your sharpness settings on your capture device are set too high (I've had the same problem but Moth3r showed me the way). If you look at the first picture you clearly see ghosting effects around Luke. Setting the sharpness lower will solve this problem. Ofcourse the image will look a little bit softer but that's just what it looks like. If the sharpness is set too high you only get "fake" detail and ghosting effects. Did you try different settings? Here is a useful thread: http://originaltrilogy.com/forum/topic.cfm/Setting-sharpness-for-analogue-capture/topic/9566/

What capture device did you use?

Did you try the derainbow before the inverse telecine step? I think derainbowing works better before inverse telecine.

I also tried derainbowing but I noticed I got some black and white frames just before a scene change. Did you have the same problem?

For IVTC I used virtualdub in manual mode.