I'm not sure the base is the only issue. I have the exact same one (aluminum) on another 7mmRM that is un-braked and has had over four hundred rounds sent through it. A Sendero with a 6.5-20x50 Mk4.
I'm thinking that it is probably the combination of the light rifle, heavy scope, aluminum rail, rear ported muzzle break, and lack of contact area on the receiver.
Yesterday I fired 15 rounds with the brake removed, then 18 with it refitted. It came loose after the 11th round with the brake fitted. This was after remounting with a degreased receiver, screws, and rail. Using a new bottle of thread lock.
If I can source a steel rail in this country I will give it a try, as when this rifle scope combo stays together it is extremely accurate and a joy to carry. Other wise it's Optiloks and a smaller objective scope.
At least I now know how to remove thread locked screws with out a gas torch