Is the case being pulled back all of the way and not ejecting, or is it only being pulled back about half way?

If this is happening, most likely, the ejector is fine. The extractor is letting go of the rim before the neck of the case gets to the loading port. Without the extractor working as a hinge the case won't eject.

So most likely the bearing under the extractor plate needs to be replaced with one slightly larger. Call SSS and they will sell you one.