Don't buy into the feathered grain nonsense, I did early on and ruined several staves trying to making the feathering just perfect. I picked up that tidbit out of one of the early bow making books or videos. This supports my conclusion that there is a lot of bad info in much of the reference material out there, unfortunately, as newbies with no experience we buy into what we read.
Who ever wrote that feathering was important must have never worked a snaky osage stave with a little twist.