The runouts are inevitable. But, they are offset by the large working area on the back of the bow. There's so much wood going into tension that the runouts won't become overstressed and fail. (At least in theory. Sometimes they do fail, but yours look fine to me.) It is critical that you round over the limbs' edges, however, or the sharp edge will give at the runouts.
Great looking bow, by the way! Absolutely my favorite profile/tiller, as John said! Thanks for posting!