I think you just invented a new saying, "a feather in the cap, hurts less then a scope in the scull".
I remember an article that was writen up about that caliber and what it took to keep a scope on the gun, and the scope requirement for long life.
I remember they had the same problem as you, they sent the package to warne and they had to heat treat the screws and use locktite, should anyway. They ended up with warne Tatical 6 screw rings, with hardened screws, and a bushnell elite scope. I remember this as being the Only thing that would stay on thier gun, thier test concluded with over 380 shots on the set up and no problems.
I do remember that that scope choice was from SSK as a recomendation for thier handcannons.
Good luck with the new set up, safety first.