I've recently updated the notes on the White Tārā mantra in accordance with a new understanding of Sanskrit. Not all ambiguities are able to be resolved, but at least it is now clear what is ambiguous and in what way. I've changed the way I present the variations on the mantra. My previous efforts were too dependent on books, and have again benefited from my Sanskrit studies.
Much remains to be done in this vein, although it is important to recall that mantras are not entirely translatable and that this kind of approach is limited. The White Tārā mantra is somewhat unusual in containing grammatical sensible phrases.