Etype, the repair people who hang out at UMGF are mostly factory authorized and following factory policy, they know far more about this than I ever will. I have been taught that shaving a bridge is a poor substitute for doing it correctly and can devalue the guitar. It also weakens the bridge - on a normal 3/8 thick bridge the saddle slot goes in 1/4 inch, two thirds of the way. Normally we shoot for having about 1/8 inch of saddle out of the slot - as you reduce the amount in you increase that lever on the slot and increase the chance that it will fail. However if a factory tech is suggesting doing this and will warrant his work, then it puts off the inevitable reset for a while. I'll just add that I have shaved one bridge in my not very illustrious lutherie career - it was on an Ovation that there was no way to get the neck off and do the reset. I did route the slot a little deeper but not thru to the top wood. The owner knows it was the only option.