DVD is not (should not) be doing anything with your files. It only encodes what it needs to, if the movies are DVD complainant m2v it will just mux the audio and video together.
My recommendation for setting is for compressor, not DVDSP.
Things that can cause playback issue are well documented here, not using top quality disc, too high bitrates and using PCM audio. Seem like you have a lot of other things going on.
Without seeing every step of the workflow it is hard to know where the problem is.
One test you should do, open the video ts folder (in your build location) in DVD Player, what does that look like. If it is good, it is your burner or media, unless you are doing something a little out of the ordinary when authoring.
I would try the project on another side/burner and get different media