mnbearbaiter, users who have commented to me on arrow flight have all said they can see no difference at the ranges they shoot at.
Any change in FOC is very small. The specific gravity of POC is about .41. Cherry is about .44, and walnut .55. so in a piece 11/32 in diameter and four inches or less in length, the difference, as I said is very small.
Reparrows' main reason for existing is to put a broken arrow back in service. Next up is that that the footing is some amount stronger than the original shaft.