A horse did not ask to be riding. It is the rider's responsibility to ensure that his mount is taken effect in its integrity and in full.
A saddle adapted to the horse is not enough
A saddle only adapted to the horse is worth nothing at all. A saddle is a tool for horse riding. The horse is a horse with a rider, in which the saddle is a variable. One, among others. But it is true that saddles have a direct impact on the quality of the locomotion of horses.
A saddle adapted to the horse is 50% of the equation, 50% certainly fundamental, but 50% of the success of the couple horse / rider only.
A saddle suitable for horse and rider
The next 50% is the adaptation of the saddle to the rider. If the rider is unable to ride the horse with the saddle horse that goes well, he will adopt a position analgesic, establish compensation that will affect the animal. If he is physically unable : it is that there is inadequacy of the saddle to the morphology. If he is unable to equestrian perspective : inadequacy of the saddle to his practice. Stay there in ergonomics questions. A saddle ergonomically unsuitable for the rider will not work, will not be just. Sometimes the maladjustment is insidious: you feel good in your saddle and nevertheless, nevertheless, because of it, nothing is going to go well : you have not the right pins. Riders do not know their horses, but does not know over themselves. And do not know what they need.Yet it is important to have a saddle suited to the rider also. For that you need to fit your saddle.
Why fit a saddle ?
Because riding is a constant evolution. Your body is changing, your practice evolves. You can only be surrounded guides again. Some are probably better than others. Look, think, try.
Find fine used saddles for sale here, and fit the best for you.