I dont post a lot but I lurk quite a bit and make lots of Ipe and Boo or Hickory bows.
The narrow flatbow that Pat suggested is the way to go IMO.
In my experience, hickory is just as reliable as boo and easier to work with. But boo is sexier.
Post pics of the hickory backing. That stuff can cope with some grain run off.
On another note, it took me 40 or 50 bows to start breaking them. As was stated earlier, totally overbuilt and way too safe. At least your getting the cracklackas out of the way now!