For comparison purposes, here is a picture of Kasane in the Courbette Magic Dressage. I took these pictures to show off the new saddle pad, but they turn out to be pretty good at showing the saddle fit. See how long the saddle panels are? You can tell by where the saddle comes over her back — it comes over her lumbar. When you look at the front of the saddle, see how the middle of the seat doesn’t look balanced? It looks tilted a little forward? That’s another problem. (These pictures were taken after riding.) The saddle would shift forward a little. I always felt tilted forward on her, but I thought it was just because she was in a growth spurt and had been butt-high for a while.
For comparison, here is the Courbette Magic on Isis. I purchased this saddle for her, and it fit her very well. Notice where the saddle length ends and how the center of the seat is balanced.
Here is the Prestige Venus K monoflap on Kasane. See how much shorter the panels are? The seat ends before her rib cage, so I’m not riding on her lumbar. The seat is also balanced and not tipping forward.