I had the big head when I started making cane arrows, all of them shot great but that is only 5 arrows so far. The last on I made looked great, was almost perfectly straight, but shot awful, I needed a dose of reality.
I stopped on the side of the road on my way hunting yesterday evening (didn't see anything) and cut some more cane. I didn't look at it closely, when I did I found every section between the nodes had a deep groove that ran the entire length of the section, no round wood in the entire trunk. I pitched them in a ditch on my way out. I know where some good stuff grows.