Jimmy,
You know I'm a cedar guy. Carbon is just tougher, no doubt. But I'd bet Mason's arrows weren't flying just right. If the nock aint behind the point, they might break.
I shoot the highest quality cedar I know of. It costs nearly as much as carbon blems. I shoot at anything I would shoot carbon at. I have nicks, deep gouges, you name it, but almost never a break.
In fact, the only problems I have with straightness relate more to how people pull them out of the target than anything else. One round of 3D is harder on my arrows than a day of stumping. I thought about getting some carbons just so I wouldn't have rush to the target before somebody starts yanking on my arrow. :D