I have yet to read all of Yogani's info on this site, so forgive me,Master, if I tread wrong.
In my experience, when you find a "way" or "technique" (mantras, kudhras, etc) that works, it may not always.
The mind can be swift and shifty, thus requiring adjustments from time to time.
Particularly with practices with kundalini, it is the kundalini that will manifest energies in many different ways, such as dancing, singing, spontaneous mudhras and mantras.
And with regard to mantras particularly, if used correctly, aid the mind to become one-pointed. This is beneficial: )
I, too, have found the mantra Om Nama Shivaya, as well as others, to bring one-pointedness to the mind.
Blessings to all and may we all find release: )