The first problem I see from what you described is the glue your using. I personally don't like epoxy or gorilla glue, never had any luck with either one. I use Urac for wood to wood, or wood to boo, ect. or some guys have good luck with smooth on, both are bow glues and made specifically for wood to wood applications.
Second thing that might be causing a problem is that it's suggested to start your fades after the end of the handle lam wood section. That takes the stress of bending into the fade off the glue joint itself where it begins or ends at the fade depending on how you look at it. There's a nice article written on that with detailed diagrams and descriptions. I'll see if I can find it.
Can't remember who wrote it, but he used to be a TG member I believe and he has his own website.
I also don't see a problem gluing Osage to Osage? Don't know why that wouldn't work, but I'll see if I can find that article and post it here for ya if somebody else doesn't post it first.