You would probably be better off with a booster. When the mounts flex they are getting weakened because the metal only bends so much before it eventually cracks, it's nowhere near going to snap as quick as steel though.
If i was you i would get one mate, It protects your frame and increases you breaking power diverting more power to the rim and not the frame. I think a Echo booster or a onza carbon fiber would fit your beast. :S .
You have been validated by the way.