With osage,I take it down to bow dimensions,then give it 6 months to cure.It is said that wood cures at a rate of one inch/year. With whitewoods I do like a lot of the others. Take the bow to near finished dimension,clamp to a form. One month on the form.Take it off,then begin weighing the stave.When it goes a solid week without losing weight I'll start tillering. If it ever seems a little soft,I'll give it a little longer,(a week or so),then try it again. JMHO . God Bless