Sam,
What a history of setting up your dulciborn and welcome to FOMD. I'm glad you found this discussion, everyone seems to love their dulciborn but a few of us have or had some issues.Christine, you will notice likes theheavier gauge strings also. Both she and Frank have some great videos playing the dulciborn and many others on this site have great videos with their dulcimers - others like me are new to playing and find so many members always ready to help.
I never would think of inserting a nail under the strings but I love that you can tune to G and with the capo able to catch most all other tunings. Makes it almost seem like the best of all tunings except, I have trouble making a clear tone on the hight frets on the dulciborn - my action is still too high. Maybe I could try this on my dulcimer, which is really easy to play with a nice low action.
Good luck with GT, I wish they could straighten out the problems they have had with the dulciborn. It sounds like you know a good bit about fretboards and adjustments. I, on the other hand am learning as I go but with help picking up some good info.
Again welcome to the site, I hope you enjoy it.

If I ever do tab it, I'll be sure to send it your way Sharon!