I don’t have time to dig into your project (not that you’ve posted it anyway), but see Help with guitar tab layout please - #8 by pianoleo
- Make Line Body that doesn’t actually draw a line.
- Build that into a Line.
- Set upbow and downbow PTs to use said Line as their transition line.
- Group Playing Techniques.
Steps 1-3 only have to be done once. As long as you save each of those things as defaults they’ll carry through to new projects automatically.