Sourwood is my favorite shafting and IMO the absolute best shoot shafts I have worked with, even better than hill cane. Sourwood is the only hardwood shoot I know of that you can cut and strip the bark on the spot and they will not check. I rarely plane the whole shoot but just bring down the butt end a bit so they are not over 3/8". The only spining I do, just like the cane I work, is to find the stiff side which goes against the bow.