Nice bow, Matt.
I've made several hickory backed osage. The latest I just finished this past weekend. 63" NTN, 70# @ 28", 1'' of set from a starting point of zero reflex, bendy handle, with no riser. She's got terrific cast with that length and weight. I was a bit worried about hand shock, but she shoots sweet, and very quiet. Where I live, it's too dry for bamboo, and I've had nothing but trouble with it cracking and splitting. Bamboo is very hydroscopic. Hickory is so much less labour intensive, and when you stain it dark, it looks nice, and you can use the bow to hunt with. Cheers!!