Making a recurve out of osage is a TOUGH task. It is difficult to get that much bend into the limbs without the limbs checking (cracking). It doesn't matter if use use wet or dry heat. Can it be done, yes but to dive in and try it on your first bow is IMO asking for failure. There are a lot of factors that can effect the stave, such as time of year cut, humidity, thickness of stave and it even varies on each tree. I have take some staves from cut to bow in under 2 months, I have some staves still seasoning after 10 years.
I have really pushed the limits of osage to see what I could get away with, luckily only had one break on me.
Thanks,
Boswell