Thanks for all the advice. I'm getting it done, now. Here is what I learned. I have no idea how to age them, but the wood of each seems to have similar weight and hardness, so I'm going with it. They are NOT as tough as I expected, though, tougher than willow, or rose, but not as tough as plum shoots.
Anyway, I procured a rock from the landscaping at work, with a medium rough surface and thus some real ability to apply friction. I used another rock to grind a small groove in the edge. This works better than a regular hook.
What I learned is that, unlike other materials, I can't just let them flex a bit against the hook as I work them. I really have to flex them pretty far, like crank on em good, and then apply the metal hook or the rock. I have to bend them more during the hooking than anything I have tried yet. actually, the plum take about the same, but I had always done plum with heat. Lot's of bend and hard, high frinction rubbing do the trick.
Next time, I willnot cut them to 30", and will leave them longer, so I have more thickness to form nocks at the skinny end. They are spining out ok, and I can scrape the front end down, but leaving a few inches will allow me to do that cranking on the front end, and allow me to mess with spine more by massing with length.
Thanks guys.