Thanks soy, there is definitely some satisfaction! (and i reread your first post and see i misunderstood, i see what you're saying now, and understand better after having done it!)
JW: Guess it would've been like that in the outer rings, but as deep as i had to go, the rings got nice and thick. the early growth is thinner than in osage, for example, so i found myself accidentally digging into the underlying ring when i was practicing. I could really tell when i was getting to the good wood when it started shaving/peeling instead of chipping off. Once there, i think anyone accomplished in ring-chasing could have had a pristine back in no time (i was quite a bit slower!).
As far as decrowning, there's something else I haven't done!
Thanks again fellas