Bareshaft tuning does work, but if your form is not real good - you'll get frustrated.
I've tuned and gotten arrows to fly like spinning drill bits - then the next day, those same arrows will wag a little left and right on me. The only thing that changed was my tecnique.
For me - I've found that my bow hand grip has a tremendous influence on arrow flight and it can give you false reads of stiff/weak if you're torquing the bow even just a little bit.
To alleviate the problem, I do this:
At the beginning of my shot cycle, I make a relaxed deep hook grip on the string, and I'm holding almost all of the weight of the bow on my string fingers (my bow hand is totally relaxed - just barely holding the bow). Then as I draw, my bow hand is lightly gripping the bow with just my index finger and thumb like an "ok" sign - but still very relaxed with no squeezing at all. In my mind's eye - the angle of the bow's can't is completely governed by the angle of my string hand. In other words I have absolutely no steering of the bow in my bow hand - its all controlled by draw arm and the weight of the bow's resistance to the draw runs down the meat of my thumb in what I see in my mind as being thin as a knife blade.
This eliminates torque.
Then the release must be perfect too. For me - in my mind's eye, I imagine that I'm slowly relaxing my fingers while I'm heavily focused on my spot. It actually happens quite fast, but again in my minds eye - I feel like I'm slowly relaxing my fingers.
If the rest of my form is correct, this results in my string hand ending up on my deltoid muscle after the shot.
Again - all other form angles must be correct (alignment, angles, back tension etc).
When the are, the arrow flies like a drill bit through the air.
When form is not correct - that same arrow can appear to be oit of tune.
So the moral of the story is - you gotta have excellent form or you'll think you're never quite tuned right and you'll keep messing around.
The delimma is - you cannot establish good form by evaluating your shots from untuned arrows.
A tragedy indeed!