Yup, the same happened to me.

The additional strength didn't do anything to fix my posture. It just let me hold my bad posture for even longer, until another muscle would fail.

You need things like Alexander Technique to retrain how you hold and use your body. And things like myofascial release to undo all the new tension you created from all the lifting with bad posture.

yep this is exactly what is saving me, and its taking a while. how long did it take you to “complete” the AT/myofascial work?