Inspired by this great observation by @NeverGiveup, I wanted to share something that's helped me make huge strides in tongue placement this week.
When getting the posterior third up, make a point to make contact with the uvula. The first few days I did this the uvula was irritated, but it provided a contact point that gave me guaranteed feedback my posterior third was all the way up.
I also noticed that when doing this, my head posture tends to correct itself.
Thanks for sharing, thinking about the uvula helps me too. Also thinking about the lingual tonsils being in contact with the palatine tonsils and uvula.