Chad, here was my criteria; heavy 900-1000 grains, perfect flight, small diameter(no bigger than the broadhead ferrule) and I could get all the components I wanted, whenever I wanted.
I didn't try fiberglass, solid glass(fish arrows) are very low spine about 55#'s and heavier than I wanted. Hollow glass is hard to find.
Compressed wood, I just couldn't get in the right spine weight.
Hardwood, I couldn't find any suitable shafts when I was developing my buff arrows(five years ago).
Carbon, I could not find a combination of shafts to meet my criteria and no single shaft had enough spine when weighted up.
Footed poc, waaayyy to light and not enough spine in a small diameter.
That left me with a stuffed aluminum, I couldn't find an all aluminum combination that worked, but a carbon 35-55 inside of a 2219, with a weighted tip, flew perfectly, it weighs 960 grains, with an foc of 12%.
I'm still experimenting, but that was the best solution I could find at the time. Rick