And I am most grateful for all the positive responses I've received, and am happy I could improve the available audio experience for these great films. :)

To continue with the subject of the LFE channel, it's worth noting that my use of 2004 bass in some places makes those particular effects sound much better than they did in the source mix. Take Vader's first appearance for example--the '04 bass is more substantial than what is heard in the '97 mix, or the '93 by itself, yet as a whole it sounds worse because the main channel portion of the sound is completely absent. That rumbling wind or rushing air type of sound, so distinctive and essential to the overall effect, is not heard at all, and by itself the bass doesn't contribute much. But when you combine it with the proper main channel sound, it comes alive and enhances the scene. The '04 mix has the same problem with the Force choke scene later on; again, only LFE is heard without the proper sound effect in the mains. Just goes to show how important it is to the mix as a whole to be able to distinguish how the different parts affect it. And, you know, to actually care about maintaining a certain vibe and not just change things for the hell of it. lol