I'm a strong believer in bubs knowing what position is best for them when it comes to birth, honestly the only thing I can think of that you haven't mentioned is the webster technique a chiro can help with this. Both my first 2 labours started off with the babe in a posterior position, they both turned in labour as most posterior babies do.
Eta also look into rebozo sifting
I had my first VB posterior. My 3rd was the same as you he just didnt want to turn, he would turn anterior than go back posterior the same day... very frustrating. I had an elective CS, but i have other health issues as well. I know many women who delivered posterior babies with no issues. I heard most babies turn during labor, warm baths during labor are suppose to help
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