Look, I'll offer a contrary opinion here.
I don't believe in bare-shaft tuning wooden arrows, because I just can't do it. I might believe if I saw somebody else do it, but it still might not convince me that I can do it. Mind you, I got pretty darn good at bare-shaft tuning carbons. But with woods, it seems that no matter what I do, they hit sideways and snap. I can paper tune them, or tune them by grouping broadheads and field points, but I just cannot bare-shaft tune them, and get discouraged as I break too many arrows.
With feathers on a Douglas fir, I hardly ever break one unless it hits a rock, and even then some survive.