I think that is what happens if you don't understand how the stave works! A bow isn't something you can carve or make froma piece of wood, it has to be what a stave wants to give you. I have made a couple of bows in the past, and they don't end up looking like your broken one! Essentially you have tried to make a take-down recurve from one piece of wood and left yourself with, as you have noticed, no flex or bend or power left in the wood. When you make a bow from a piece of wood they don't finish up shaped like that, they finish up looking pretty much like the stick they started out life as!
Forget the over engineering of a piece of diried wood, go and cut a big straight, knot free limb, let it season then slowly, slowly, slowly shape and taper the limb each side of a middle point