The pads conform to your horse & do not cause any rubbing or discomfort for the horse. It may bring your saddle closer with the withers but will not cause a problem. They also have shims to put in the pads in need be.
Like the saddle fits him fine, but like the front get's really close to the withers, like I'm afraid it may be tapping the top of his withers when we are cantering, so I was thinking about getting a CE BIOFIT pad or a built up pad. I think a thinline pad would only make matters worse in my case, however, I have heard good things about them.