If you eliminate all chapter end actions is a single timeline, then you will get seamless playback for the timeline.
Is there a natural break at any chapter point in your timeline? If so, you could split your 23-chapter video into 2 timelines, and then use individual chapter playlists for each of the timelines like you did for the big, original timeline.
If you want to use overrides, then each chapter will need to be in its own timeline, and you will need a second copy of the entire program for seamless Play All. You may not have room for all of that on your blank media.
Adobe Encore CS3 has fixed all of these issues, so if you are using Premiere Pro as your NLE, you may want to consider an upgrade.
-Jeff
The Focal Easy Guide to Adobe Encore DVD 2.0
