Bravo, arthur p great explaintion.....
I will add not all carbons are light and agree with heavier arrow (cx hunters @ 10.5 gpi)
Some af acc by Easton are heaveir yet. I shoot what ever I have in hand preffer carbons
but can shoot aluminum if I run out of arrows on a 3d course. What I am thinking here a what fails to said if you want or need that air scoarching speed ussaully carbons are the way to go. But if you are keeping things to a "normal" speed say to 250 fps tops.
Nothing is that finicky from arrow, bow tune and body form. Once that is pushed all sorts of little things happen to make that group larger.
Carbons have grown up but they are perfected and aluminums are the old man here, tried and true.
good luck......