Just an fyi, a lot of Centered Riding is based in yoga, also Alexander technique and Feldenkrais therapy. Don't' feel you need to look those things up; I'm just pointing out that there's a lot of cross over from yoga, and you'll probably find the core exercises and the body awareness helpfu in your riding.
Centered Riding is not quite as popular as it was back in its heyday, and it was always was a very flexible teaching tool that allowed you to pick and choose what worked for you; it didn't require that you drink the Kool-Aid and march in lock step. However, the two things from Centered Riding that have STAYED in my teaching repertoire since I first encoutered them, without exception, are the exercises for teaching a true following seat at the sitting trot and the ones for a true following seat at the canter. I have just never encountered anything better for helping riders master these skills.
Good luck, and keep posting video as you work through this - lots of riders (if not ALL) struggle with this, and other folks can benefit from your experience.