What ever Arne says. I've been shooting for 4 years now and am finally,with help from the guys here,am starting to get it.......
A little. Unless your release is perfect, you are just guessing as far as tuning goes, especially bare shaft. I think about my early arrow flight and just shake my head. I'm green now but I was really green then.  The guys here will help you.

Often when guys bareshaft and it shows slightly weak, It evens out when the shaft is fletched.