So am I reading this correct Orion, your saying that the feathers off of a young bird and their thickness won't make any difference in how they sound whey shot?
If so, I beg to differ. I've experienced it first hand, and not only were they noisy but they actually screamed all the way to the target. Same style, same length, same fletch, same helical, just a different age turkey.
I fletched 3 arrows with a young bird....they whistled, screamed, whatever you want to call it.
Stripped them off and immediately fletched with mature tom primaries and they were completely silent.
The young bird was undoubtedly less than a year old, and the tom was at least a year and a half old. Noticeably thicker feather, longer, and much beefier when chopped.
Just my experience is all.
I'd also like to add that Stringstretcher is a top notch guy and he is true to his word, I honestly believe that. The feathers he sent me on a trade were perfect, but I grind my own and only needed some primaries. He sent me plenty on trade and even some extra, he is a man of his word. I would deal with him in confidence any day.