I have a 15.1 pear too!!! Have tried so many of the above suggestions and still ended up over her withers! The key for us was a flat tree from front to back, so for example the Stubbens were a terrible idea as they are more curvy. Even the wintec Isabel rocked up her neck. We had good success in an older Albion comfort for dressage. Now she has a gorgeous Black Country Solara Vinici(monoflap) xc saddle that fits her like a dream and we do everything in it because she rejected her previously fine dressage saddle once we got the BC.
Once we figured out that we needed a flatter tree front to back, finding options became easier. Several saddles designed for more baroque backs are good possibilities too. Basically, she has a flatter back and more curved trees were very slightly rocking (i couldn’t feel it), this motion coupled with her pear shape was shoving the saddles up her neck! Good times! Hope this helps!
