Nice results on that bow build!
This process looks quite familiar. :-)
I built a couple of different bows using lumber yard red oak. If you find the right piece of wood, it's pretty easy to work with. One thing that I found with oak is that the bow limbs tend to take a set, and don't return to straight after you unstring the bow. I'm guessing that most bow woods do that to some extent over time.
Yeah certain woods tend to take on my set then others. Also if you stress the wood out during the tiller process it can also create set