RE: New carbon won't spin straight
As long as the wobble isn't at the nock end, you can use a mechanical on that arrow.
I know, I know, this sounds like a bandaid; but, it's an option that I use in a very unique way. I keep two of six arrows in my quiver loaded with judo tips for practicing from the treestand when I leave the woods. Since these arrows are shot into the ground a lot, I can't depend on their tips being straight if I need them for hunting in a rare instance. I keep two small mechanical BHs tapped to my quiver just in case. I know that I'll get decent arrow flight should the occassion ever arise.