GOP, Sync Issues, Compression Markers in FCP?

[Edit: sorry for the double post. I thought I missed the button the first time so I clicked it twice. Moderators, can you delete one of them?]

I know this issue is all over the web, but I haven't been able to find an answer after many hours of looking.

I'm editing a rather large project in Final Cut Studio 2. It's a sports training DVD for basketball coaches by Bob Hurley, the winningest high school basketball coach ever (and a great guy too).

Anyway, we have a natsound track and a commentary track for all the drills he runs in practice -- two audio streams for each video stream. So I'm exporting video only, then the two audio tracks via "Audio to AIF" export option. Hence, the files don't have exactly the same root name structure as if I had exported audio and video together, so DVDSP doesn't bring the audio in automatically. That's no big deal, but I'm having the dreaded "AC3 files are different lengths than the m2v files" issue, even though they are exported from the same sequence with the same in and out points.

I think I realize that this has something to do with GOP, and chapter markers needing to be on an I-frame. (BTW, I shot and am editing in HDV, using ProRes in render options). Do I need to add compression markers at the end off all my sequences to force an I-Frame?

Should I just put all my assets on separate tracks in DVDSP so they stay in sync? I don't mind the playback lag for this project.

Am I missing something?

I'm not nearly as good in DVDSP as I am in FCP or in the audio world... I have always found DVDSP a bit confusing, but I imagine it has more to do with the DVD spec than any conscious decisions made by Apple.

Is there a book I should buy? Should I get Apple certified?

I know this is a lot of questions, but I just missed the deadline for this project today, and I'm pretty bummed out about it, although the client is being cool. It's for Reebok and could really help my career. The project is going well -- I'm just stuck now with a lot of great material and I'm having trouble getting it onto a DVD. A common problem, I'm sure.

So, I'm drinking many cocktails and listening to house music into the wee hours to try to regroup and have at it again tomorrow afternoon. Booze and beats are the only thing that calm me down, except for my beloved Klonopin. :-)

Anyway, I digress. Any help or guidance much appreciated!

Thanks!

-Tim