I'll try to sand the hub between the blades, the side that is heavier. I've never had a prop failure at the hub, always a blade break. But if it doesn't seem to be improving I'll just add a good size glob of 5 minute epoxy to the light side. By adding material, you can sand if you added too much. The way the Dubro Tru-Spin Prop Balance is designed, it has extremely low friction so the heavy side is always detected.