I have read it suggested here to do Z-Wave Device Exclusion first before doing Device Inclusion for a new device and follow that religiously. I haven't kept track but I would guess that for over 30 of my 37 devices, doing the exclusion first found a device and excluded it. Then, I immediately included it with success. Knock on wood, I have never had a failed Inclusion or Ghost Node created and I am curious if it is all related.
Let me know ya'lls experience when running Exclude prior to Include with new devices.