Brie,
I have posted about Pelvic Tilt before. I have been doing NBE/HRT for over three years now. I have never taken BO because, for one thing, I don't want to lose my fantastic female libido

and I've heard that BO can sometimes decrease libido.
Many changes that I have experienced in the course of my feminization I was never expecting, so I now they're not psychological or the result of wishful thinking. And, like you, I have
loved them all and look forward to more!
So do you think I have Pelvic Tilt? In the photo below, you can see how my lower back curves inward. How does this compare with yours? This is my normal posture now--before I used to slouch. My shoulders are back, and my feminine rear sticks out more. You also reported changes in muscle tone. You can also see that my upper arms are very thin and smooth, with no visible "male" biceps. This means that I have very little upper body strength now, but I don't care! I don't play golf or other sports anyway.
These changes, yours and mine, are exciting! I'm looking forward to seeing your photos.
Love,
-Graceful