You usually can use a wither pad to raise the front of the saddle. They generally raise the entire saddle as well, so you will lose some of the close contact. I cut a Wintec pad in half and used the front half with a thick wool blanket under it. My horses seemed fine with it.
If the saddle tree is the right ANGLE - the bars flare out away from the backbone at the same angle the horse's shoulder does - this works. Remember, all horses are not the same distance across the withers. My Arabs have narrow withers with wide shoulders. Most saddles with a wide ANGLE also have a wide width (what a western saddle would refer to as gullet width - the horizontal distance across).
If the saddle fits the angle, but is too wide horizontally, then padding works.
If the angle is too wide for the horse, padding will cushion the pressure point some, but the pressure point still exists. If the angle is too narrow, it will prop up the front and give you wither clearance, but dig into the shoulder. If the angle is wrong, padding doesn't help much.
The horizontal line at the top is affected by the horse's horizontal width. The angle is affected by the angle of the horse's shoulder. It shows a western saddle, but English saddles also vary both horizontally and by angle.