If this is pure data on the DVD, I don't think you can copy it. I guess the data is stored in some database driven way and it's not made to tamper with.
Leaving stuff off or so won;e help you out I'm afraid. As you can't compress the data on it, there no room to gain there as well.
For the best, you'd bave to wait for the DL burners to become available, as those can burn about 8.5Gb on a DL DVD disc...
All you have to do is hope that your system can read these media!