1. You've listed the desired Mode, but not the ending.
2. The pointing of English text is more of an art than pointing Latin, which can be done by strict rule: see the Ford introduction to the American Gradual, for example.
3. Not sure quite how you wanted it typeset. Here's a version of Ad te levavi. Note there are no vertical episemas anywhere, the English text is unaccented, etc. I chose to start the second part Psalm style (do do do) not Canticle style (sol la do). Using only one annotation line because I couldn't get two lines to work on gregorio.gabrielmass.com: Let me know what you think. Now is of course the best time for tweaks and style guides.
Also, I was thinking that it might be possible to build a Psalm-tone gabc generator, taking syllabified and versified text as input and automatically applying a tone and generating the gabc to render it.
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