No offense intended, but I think any bow that takes 5" of set is flawed in design and execution. I think your bow is too narrow at the grip, and doesn't taper nearly enough to the tips. It looks like it hardly tapers at all. Your bow looks more like a broom handle, than a bow.
Also, the bottom limb tip is reflexed, and the top limb is not, making your tiller very uneven. I aslo think you're asking quite a bit from a hackberry stave.