I am new to this forum and can only speak from my own experiences. I tend to agree with Ray "Black Wolf" in his assessment of "bare shaft" tuning including his point related to "good form"; however I have seen and been able to be successful with bare shaft tuning without perfect form. One year ago, I converted from the Compound bow to traditional so I have had one year of the learning curve; I read the books, watched the videos and then started applying what I learned. I also attended a Black Wido Shooting Clinic and saw first hand how Mr. Ken Beck used bare shaft tuning for all twenty attendees to get the arrows shooting straighter, regardless of form and there were a lot of brand new shooters and some with two years or more with descent form. I am a big fan of O.L. as I bought an ACS Z CX Longbow and actually won the second day "shootout" at the Black Widow Shooting Clinic. I agree with Ray in that form does make a difference, but this Shooting Class of 20 had form all over the place and we all saw how shooting bare shaft and paying attention to the arrow in flight as well as the impact position (target may flaw the impact position) can clearly indicate high/low nock or weak/stiff shaft. I don't believe that the nock left or right requires perfect form to clearly see; at the shooting clinic, I watched most of the 20 shooters go through this and it was clear and obvious to everyone that the arrow was flying nock left/right or high/low and when an adjustment was made (added point weight, etc.), the arrow flight was improved, most of the time. This was not a scientific study, but the results seemed to be very beneficial to everyone's shooting and I believe everyone benefited from Mr. Beck's approach to tuning.
I did my own bare shaft tuning prior to attending this class and interestingly enough, most of my bare bow tuning instructions came from O.L. Adcock's site, A&H Archery and Black Widow's websites. With relatively poor form initially, I was able to get my bare shafts shooting very straight with groupings that were within the fletched shafts with a lot of shooting. I used a lot of different methods and most worked to confirm the others.
Summary - bare shaft tuning did work for me even with less than "desirable form" and it worked for the attendees at the shooting clinic.