I have a 14 year old Belgian mule that I have been struggling to fit. He has large shoulders and withers, and seems to have possible muscle wasting behind the withers and shoulders. He has had this conformation since I bought him last year and has not improved in the year I have owned him. We are pleasure trail riders but often enjoy long weekend rides on various terrains, so he is neither totally fit nor unfit. I recently purchased a Down Under Kimberly Superior Aussie saddle, which I absolutely love, but I am still not getting a perfect fit. Every saddle I try slips back into the pocket behind his wither/shoulders. Down Under states the saddle should be fit above the shoulders, but I simply can’t get it to stop sliding with breast plate, non slip pad, and neoprene girth. The problem is that the saddle does not fit properly when it slides back, and going more narrow doesn’t seem to be the right solution to me or them. When I pad the saddle up here he seems comfortable, but I have never been able to ride in the “correct” placement for comparison.
Is this his saddle “sweet spot”? Or should I try something else to bring the saddle forward?