since the bow seems quite heavy,, maybe scrape off the sap wood,, I am guessing that is what cracked,, down to a good layer,, then sinew back the whole bow,, and make minor adjustments in the tiller to get it working more evenly,, I have a feeling it will shoot,, sometimes I am overly optomistic,,,just saying if it was my bow,, I would not give up yet,, since it didnt blow,,,,or at least down to a non cracked sap wood,, then sinew back,,