sal was talking about a belly lam added after the ipe. Like a boo backed, ipe core, and osage belly. A trilam so to speak.
with your not, depends if you need a bow, or are you just hobby building. When I make a bow for someone, I go with a sure thing, when it's for myself or a hobby bow, then I'll use questionable wood to see what happens. If you don't mind the work possibly ending in splinters then take chances, if you want the best possible survival rate, then get a new piece. At least that's how I look at it.