The mantra's vibrational power will be Increased by the right pronunciation. But what will make any difference most is your intention and focus. In time, and with apply, pronunciation will occur proper. For Conze, the final section of the development of Buddhist mantras would be the tantric phase of Mantrayana. https://robertk555dvm5.goabroadblog.com/38022808/detailed-notes-on-shodashi