This always puzzles me

[Badger]

  I would definitely flip that inverted stave over, even slightly concave works better flipped. Concave is kind of a pain to work with.

[Mark Smeltzer]

Isn't that the technique used by one of the modern bow builders .....kinda like a tape measure, the shape adds rigidity to it. I think the theory applied to bow making means Less material for the same draw wt., equals a faster bow. 
I think I would try it if the concave was fairy consistent down the bow.
 Just my two cents.

Mark

[joachimM]

the shape adds rigidity to it.

Mark

It will indeed add rigidity. And it will increase the likelihood of a catastrophic bow explosion too 

[Carson (CMB)]

I had that in a bow I recently finished and sent out to someone. It never occurred to me that it should be a point of concern when sending a bow out. It is just how that piece of wood was, and it was a nice piece of osage in every other way. I don't think it detracts from a bow in any way.