Well, tried to introduce flying changes to our repertoire, and it seems that whilst Fitz's hind-end engagement has improved dramatically, it's not quite there yet. He can do it one way beautifully, but the side where the brunt of the change is on his funny leg he just can't do. So we're back to travers and renvers, and lots and lots of downwards transitions to try and build up that engagement.
The difficulty with Fitz is that he's very good at faking it. He'll partly engage, so that you can feel his back come up, but he won't properly track up, he'll just slow his strides. He can trot so slowly it's almost piaffe without engaging at all, so actually making him do it properly is a bit of a challenge when he's pretending that he's doing it properly. However, spoke to my boss and have been teaching some of her more advanced lessons where she uses him, so have gotten a chance to see exactly what he's doing from the ground and teach through it, so here's hoping this will help a bit.... He's a lazy boy ;)