I’m not feeling well today, but hopefully someone else can help walk you through how to use the Z wave tweaker to check and see if the parameter settings are the same on the one that is working and the one that is not. That’s just an easy thing to eliminate, so it’s the first step I would take in troubleshooting.
Separately from that, when’s the last time you ran the zwave repair utility?
That can often clear of latency issues, but it can take a while for all the neighbour tables to be built so you may not see improvements until the next day.