Need to Replace Pinion Seal Again

This is the second seal installed since the rear was rebuilt last August. A shop that I trust did the first seal when they set up the gears, and it leaked. I did the second seal, using RTV around the outer flange, so I know that the leakage is coming from the seal to shaft mating area. With that assumption, I was looking for a shaft saver to build up a couple thousandths to increase the pressure on the next seal and hopefully stop the leakage.