Luke,
My last bow was a takedown. Each limb came from a different tree (also from a different state). The Nebraska limb has nice thick rings and the Texas limb had extremely thin rings. They both came out about the same thickness and work well together. Thin rings are more challenging to chase, but so far I've never had a piece of osage that wouldn't make a bow because of ring thickness. Tillering isn't any different with either type of ring. I say go for it with your tight ring'd stave.
Acker,
Not only would those make a bow of any draw weight you want at 67", you could split at least that one in half and get 2 bows of that draw weight. I don't back osage bows unless there's some reason to (nasty knots, bad checking, insect damage, violated growth ring, excessively short, etc).
Good luck to both of you.
George