I cranked it up this afternoon and played my current 2.1 file upmixed with Neo:6 by the receiver. My lady friend gave it a listen with me--I'm so fortunate that she is understanding/tolerant of my audio habit!--and she pointed out that the bass was still a little bit too loud in a couple places. The one I've been the most worried about being potentially excessive is the Star Destroyer going overhead in the beginning, because I made huge increase to the LFE volume compared to what is on the SE (+12 db, 4 to compensate for the difference in average volume between the '93 and '97 mixes, and the other 8 because it was just inexplicably subdued). But she said that part sounded perfect as I currently have it; the problems tended to be with Millennium Falcon flybys. Many of them were spot-on, but she was right that I had occasionally still overestimated how much bass was actually needed. So there's still a little more tweaking left to be done. I don't know why the SE versions have the Star Destroyer's signature 40 hz rumble at such a reduced volume compared even to the quieter shots of the Falcon; the sense of proportion is all out of whack.
This sort of thing can be pretty subjective, of course, and it depends a lot on room acoustics and subwoofer and listening position placement. But rest assured that this is about 99% finished. I will be making my files available on sendspace, since I have trouble with newsgroups, but they may find their way there also.
Right now we're getting ready to see Iron Man--there's a double feature of the first film at 9pm and the new one at midnight, so we are very excited for that. :)