Well folks, it looks like I'm all done with my Star Wars sound editing. RotJ is finished, and I've uploaded the files for Satanika to create the 5.1 mix. Barring any last minute changes, it should be ready as soon as I've heard back and verified that it sounds right.
I ended up making an edit that I hadn't anticipated originally, which was to replace the section of the '93 mix where Luke defeats Vader with the 35mm version. I started listening to it because Mielr pointed out that the '93 has a noticeable music dropout in the left channel just before Vader loses his hand. This dropout can be heard in the 35mm also, but it stands out a lot less; more importantly, I found that the music is much more prominent, while in the '93 the lightsaber crashes are too loud. The music isn't being drowned out, but it doesn't carry the scene the way it does in the original mix.
Consequently, I decided that the 35mm version should be used instead for that scene. Darth Mallwalker sent me 32-bit, 96 khz captures from three different laserdiscs, which I compared closely to determine whether any remixing had been done in the 80's. My conclusion was that they were all the same mix, but that the most recent of the three had been remastered with peak limiting. I decided to use the first version, and to match the Belbucus '93 mix the capture was processed via the iZotope sample rate conversion to 48khz and dithered to 16-bit with their MBIT+ algorithm. (These are said to be among the best quality converters available anywhere.)
The result is that this iconic scene now sounds considerably better, and with the added benefit of the LFE channel and the Obi-wan music that was discussed earlier, this is a very satisfying mix for RotJ. As with ESB, it isn't meant to be the 70mm version, since there are no recordings to use for reference, but it is extremely satisfying nonetheless. Look for this to be available for download soon, and all three of my 5.1 mixes will be appearing on the version 3 dark_jedi dvd encodes, which are now also nearly complete.