RE: To tune or not to tune? That is the question
If his arrow was not flying straight with fixed heads they would not be grouping well or hitting with the field tips. If you can get your bow to do this it is already tuned better than most set ups. This is exactly what you do when you fine tune a bow, why would you change it? And shooting thru paper at this point would be a step backwards in the tuning process.
I'm not saying you couldn't possibly get it better if you shoot really well, but what you have is what most strive for and can't get do to form problems, rest issues or improper spine.
Also the type of head you are shooting and the amount fletch you have will play a big part in it. Bare shaft tuning may help you fine tune it a bit better. Some arrows just shoot well with fixed heads. My nitro stingers were VERY easy to tune with a broad head.
Paul