Call me the odd one, but I've never measured the amount of torque I use when tightening the screws holding down bases. I always make sure the screws are quite snug in their holes, but not so tightly that I risk breaking something. To my credit, I've never had a base or rings give me an issue.

On heavy kickers, I put a small drop of Loctite in each of the holes before I put the screw in. That may or may not be what you're supposed to do, but like I said, all my scopes stay in place.