The only audio sync issue on Star Wars v2.5 is toward the end of the film, and it's a one frame sync problem (~.042 ms), which most people find unnoticeable.

Any other sync issues are much more likely caused by either downloading a low-bitrate re-encode, or issues with the playback software. I know some players find DTS-MA to be a little exotic. You can test this by trying one of the Dolby Digital tracks (i.e. the commentary). If it syncs fine, then it's the playback software that's the problem. That's my guess.