Well it turns out, that after I let the osage dry a while, there were checks all along the back side of my stave. Then again I didn't see the advice Pat B. gave, (coating it with shellac) before I boiled it. I believe I will convert my boiling kettle into a steaming kettle by welding a rack inside of it to keep the staves out of the water. I will also make a lid for it to contain the steam. Hopefully this method will work better.