Tuning is to make a shot "accurate"
But accuracy is even more on human flaws
So the question is
During the tuning how one can know the miss is due to human flaw or mis-tuned bow... The miss can be significant
In my opinion, tuning is doing those things that make my bow and my arrows work well together. Assuming a certain degree of consistency in my grip, release, etc. there is automatically built in to the equation consideration of my flaws. In short, the equipment is also tuned to my flaws. This may mean that another archer might not get great performance out of equipment that flies true for me.
I use the six pack method. I shoot six arrows and tune from where the majority of them hit.
Interesting topic. Went outside to papertest a new set of arrows the other day. Got a little down when the first arrow ripped a 2" tear through the paper. The next one just the same... The third made a nice little bullet hole, and then I focused a little harder on my release. Result: three more bullet holes. So I agree with Dan here, if the archer is out of tune it doesn't matter if the arrows are perfect.
The degree of inaccuracy is equal to the sum of human and equipment errors. So reducing either one helps. Tune as best you can until you learn good form. An arrow chart is better than nothing.
Tune to the majority of your hits. If 4 are showing one thing and a fifth something different then assume the oddball was your mistake and press on.
You're absolutely correct Dan. Until you can shoot with good consistent form and accuracy your "tuning" will always be suspect.
It is likely why so many seem to have difficulty with the tuning process.