hi, I am a chinese,english is so so, so let me try to understand your meaning, the horse often was hurt by saddle, because high withers and narrow shoulders ,
We often met the same trouble, first, using double saddle pad,and fasten girth(two girth, frong and rear),
The second, change the gullet angle,readjust it by saddle maker,
My friend, made a pad with a hole in front the pad,
Last time I got a saddle from usa, but most chinese horse narrow shoulder.
I havd to solve the same proble. You can email me firstname.lastname@example.org
I show you the pad