Tallk about great timing, I was just yesterday looking at an Osage stave with a 90deg. twist. Your post and the answers will help me a lot. My stave is 2 years cured, but I am still gonna try the "grease, steam, straighten, relfex" all in one move trick.
Thanks for starting this thread, and thanks for all the responses.
( I sorta feel guilty stealing ideas from other folks posts)