tried "The firm".
used dvddecrypter in ifo mode, selected the movie, 1 audio stream, 1 subtitle stream. deselected last chapter (credits). ripped the stuff.
created new ifos using ifoedit. played the movie in the dvd player of ifoedit. worked fine. the movie was 6.5GB.
ran dvd2one. the resulting size was a tad over 5GB.
re-ran dvd2one on the 5GB video. resulting video was right on the mark: 4.37GB.
Burned using Nero. Played perfectly on my DVD.
looks like if u use ifo mode of dvddecrypter (mainly to delete chapters), u need to run dvd2one twice to hit the right size.