I'd use the stave on the right, No need to add any reflex to that tip, if you seal the ends with titebond II, and let it dry a while with the bark on, it will naturally reflex on it's own. After a few months take off the bark and let it finish drying. Also leave the curvature on the back, don't decrown it. Rather have the cross section of the limb oval shapped and leave it around 1 3/4" wide at the widest place. Pyrimid limb profiled, leave it as long as you can to avoid exess (over 1 1/2") of string follow. This design is a challenge to tiller but I think you can do it.