RE: Spiraling problem.
I know exactly what you mean.
Are you getting fletching contact and/or is your bow properly tuned? Are your arrows all straight in the target?
If all that is good, it may be an optical illusion.
I would assume you have an odd colored fletch as most do. Sometimes in certain lighting conditions, the arrows spin in flight can cause the illusion that it is spiraling. I had that issue and thought my bow was out of whack. But if everything else checks out, it could just be your eyes playing tricks on you.