Sticking to your width and no more osage or yew and nothing else is worth trying ...anything else will have a much higher failure rate,or being a over stressed out beaten dog. If you can be OK with more width then the possibilities open up to some more woods such as hickory,elm,hophornbeam,and even black locust,or sinewed juniper... But even then I wouldn't be using any flawed,knotty,twisty, character wood...it wood have to be primo 98%+ clean and straight wood for me to even want to attempt that with any kind of wood. This is all coming from experience in pushing the envelop with high stressed to the max designs with countless types of wood. And like badger I have had more than my fair share of reality checks in doing so.