Did check out the Theatrical Audio Resources - article on your site zombie, and you might want to make a few minor corrections on it.
"In 1985, Ben Burtt supervised a stereo remix for home video, taking into account the acoustics of television audio (as this was the pre-home theatre days it has the least dynamic range of any mix)."
Comparing it against the original Dolby Stereo tracks available, the dynamic range is pretty equal. The '85 re-mix have actually a wider stereo separation.
"But there are more obvious examples, probably the most noteable of which is that Aunt Beru is voiced by a completely different person (neither the stereo nor mono version is actress Shelah Fraser)"
Is this correct? As I recall, ADR was done with Shelagh Fraser for the film.
"The 1993 mix has been theorized to be based off the 70mm stems, since it is missing a few sound effects (such as the crashing snowspeeder) that appear on the stereo mix (as the 70mm would have been readied first, it is thought that these effects were only added for the later mixes). There are no surmised differences between the other mixes of the films, however."
The '93 remaster was done by going back to the four-track master mix, THX Technical Supervisor Dave Schnuelle's own words on it;
For The Empire Strikes Back the best material was the four-track master mix. It was supplemented with “boom” from a sound effects master running along in synchronization, in the same manner as Star Wars. What you must realize is that the perceived low-frequency capability of conventional optical sound tracks is very limited, and what most people remember is the 70mm version. Since the existing Dolby Stereo print masters had to be limited for optical, that means that they sound bass shy much of the time, so this addition should be considered to be really a purist one, getting it to sound more like itself.
Why the sound effect went missing for one of the crashing snowspeeders is unknown. David Morgan's in-theatre recording of the 70mm version tell us that this sound effect was heard in the 70mm mix as well. If you exclude the low frequency and much greater dynamic range of the 70mm versions, the 35mm and 70mm mixes is overall quite similar in terms of content, see here: http://originaltrilogy.com/forum/topic.cfm/70mm-6-Track-Dolby-Stereo-mix-differences/topic/14058/
I also noticed that you list the 1425-85 ESB LD as containing a 1985 Stereo Remix, nothing indicates this to be the case, it seems very much like the original 35mm Dolby Stereo mix was used, the difference is that it was encoded with digital sound in addition to the analog track.