I was having the same OOF errors and Node 255 timeout issues too and found out why installing the Z-Way software fixed it for openHAB.
The Z-Way install output of interest:
Preparing AMA0 interface:
removing ‘console=ttyAMA0,115200’ and ‘kgdboc=ttyAMA0,115200’ from kernel command line (/boot/cmdline.txt)
removing ‘::respawn:/sbin/getty ttyAMA0’ from /etc/inittab
AMA0 interface reconfigured, please restart Raspberry
Z-Way install command I ran for reference:
wget -q -O - razberry.z-wave.me/install | sudo bash
Chris, maybe these kernel command line changes make sense to you?