First, many thanks to Yogani for the treasure of information made freely available to the world for access.
I started practicing Kechari Mudra in January of 2017. As of today, I am able to reach the nasal septum since my Kundalini continues to purify my nervous system. I am slowly approaching Level 3, as the tip of my tongue can now touch the upper part of the nasal septum.
I've noticed that the tip of my tongue appears to be peeling skin! The the tip of the tongue is red/pink but is surrounded by a white outline. I can basically see an outline of where the tongue enters in the nasal septum at the tip of the tongue.
Getting to stage 3 Kechari in less than 6 months means that you have taken up this mudra quickly. How do you feel? How is your meditation? How long do you hold the mudra every day?
I have not noticed any change at the tip of the tongue - only the fact that it is very sensible, as it is the entire mouth and the nasal passages, with the energy expanding in the nervous system.