Here is the answer and you should be fine:
1) In Premier Pro 1.5, go to the Adobe Media Encoder. At the top where the drop box is make sure that you have MPEG2-DVD SELECTED.
2) OK, now you will see some options that you can change. Click on the option that says video (it has a green check on it). Set your quality to 5.0 Set your bitrate encoding to VBR, 2 pass.
3)Next under your bitrate settings you have 3 options (min, target, max). Set min to 6.0, your target to 7.0 and your max to 8.0
4)Adobe Media Encoder is going to separate the video file from your audio file. So you will have 2 files (one is the video file and the other is going to be your audio file)
5) In Encore select file import assests and select both files. After that right click on your video file and select new timeline. Now drag your audio file on the timeline. Make sure it is lined up correctly with the video file to keep them in sync.
6) Export your DVD now and tell me what you think.