I have had similar problems to get my Razberry working until I stumbled upon a post that said that in the RPi3 AMA0 is now the Blutooth.
On RPi3 you need to connect to /dev/ttyS0 in order to reach your Razberry.
Still with this info it didn’t work for me, something else was also wrong. But I did these steps described by BlizzWave and after that myh Razberry is Online.
Btw, that was some nice logs you got there, I have to see if I can find them as well. I guess they can be useful.
