1. The audio _TS folder coming first sounds like a good idea given that its contents are always bigger (on DVD-A's) than video_ts.
2. Unlike with video titles, I couldnt get the LB dialog box to appear at all with DVD-A material, yet the total size required DL.
3. Note your attitude to -R DL. I have tried TDK's +R DL 2.4x disks and they made at least 3 older DVD players crash when searching menus on large video titles (newer DVD players are OK) , so I standardized on Verbatim -R DLs and have had no further problems. I assumed the problem was +R DL compatibility, perhaps its a TDK issue instead. a number of my colleagues have had similar issues with +R DL. However you seem to have had a different experience. I would welcome hearing more about your strong preference for +R DL