I've never been a fan of DVD Lab Pro for rebuilding discs (I do use it for custom ground up discs though). For one thing it only accepts text subtitles (does the original GOUT have subs?).

The other issue is the chapters points. They are moved to the nearest I-frame.

When I rebuild discs I use Muxman. You set the celltime for the chapters, and that's where they end up. (It also takes subtitles in untouched .SUP format.). (Oh yeah and the basic version does everything I need and is free.)

You can then use the output with VOBBlanker to rebuild the disc with the new movie.

...Just my method FWIW.