that amount of twist is no problem,,,your problem is the wood it self than first inch or so of the wood under the wood is no good,,it must be taken down to the good wood that is toward the core of stave, the wood under the bark has to much earlywood,,and could never take the strain of taking the twist out,,,,I will try to find a stave here that twisted and add it to my osage demo in the how to section,, mike