Loon, good questions. But it would be too hard to get a generalization. We are better off trying to find a well balanced design for a specific weight bow and arrows, first. And probably for a specific wood as well.
As for me I just want to find a way to shoot 10 GPP arrows at 180 FPS. For now, I use hickory staves almost exclusively. The main question for me would be what would be the best ratio of width and thickness for hickory for my purpose. I read in "Archery, the Technical Side" that the best limb design is probably a rectangular cross section and pyramid front profile. In that book, there is a way to get that ratio. Still learning how.