I think the ball bearings are the right size. Looking at the cage, it seems slightly different. That is why I think it is now wearing on the spindle(can hear it, specially on hills). At this point I am not sure what other option I have then to hope that the wear finishes soon and the noise goes away. I don't think I could use loose ball bearings as they would probably take some coordination on my part as there would be nothing to hold them in, especially on the fixed side. So solving one problem created another.