Re: I can\'t believe this
Scope like NXS and MK4's have significantly thicker aluminum bodies and can take more torque when you tighten scope rings, but most 1" tubes will collapse to varying degrees if you over squeeze them by tightening too much. I have seen several Leupold VariX111's that have recessed areas on the tube where the rings were clamped too tight. I also have a Leupold 6.5-20 that I overtightened, just using the little allen wrench with the resulting squeeze section, looks like hell but the scope functions OK. I knew that I should not overtighten those rings, thought I was just getting them snug and still crimped the barrel.
I was told that the large tactical style rings such as Badgers and MK4's develope significant clamping forces because they have four capscrews sucking down rather than two. That is why they only need 15 inch-pounds, plus they have a very large contact area to the scope tube.
Just thought I would warn that too tight can be as big a problem as too loose. Too tight can also cause internal stuff to jam. They weight of your scope might also be a factor, heavy scopes are apparently more difficult to hold in place than a light scope.
If drying the plastic inserts does not help you might need a set of rings with more contact area, I would be carefull about overtightening the screws. We can also damage the entegrity of the screw by overtightening it, many armourers throw away used screws because they fear that "stretching" has taken place. These guys always replace new ones, preferably TORX.