I haven't used carnivore's but have used executioners for the last couple of years. Black Eagle seems to offer a high quality product. I have found most completed arrows weigh with-in .2 to .6gr. spread across a dozen with many being the same. Considering all the components that go into arrow making glue included, it pretty hard to find a closer tolerence. My arrows weren't purchased as a matched set only custom fletched. Great, very accurate arrows in my book.
I know early on some of their target arrows were extremely brittle, you could look at them and they would break. I would imagine they have worked out those kinks now as quite a few people are using them now.