The ball might look good, but it's got to be out of round.
You can repair deep gouges easily using your regular plug. Clean the gouge, use the smallest dam that completely covers the gouge, mix a small amount of clear plug and pour it. When it cures, work it out just as you do with finger and thumb plugs and you'll have to look hard to tell where the gouge was. This is also a great way to use the small dams that are left after you have used the large ones. -- JohnP