Ok first just FYI on the DZPD3 you might want to check out this driver:
[DRIVER] Leviton Dimmers (DZPD3 / DZ6HD)
For the VRP03 I think that is one of the very old devices that do not play nice with a C8, something with the zwave radio chip they do not like. Is that a Vizia RF device? It is most likely 300 series chip: https://products.z-wavealliance.org/products/832
Also, about your z-wave details. Any entries you have in there with no device name showing is what we would call or dead or ghost node. Sometimes on rare occasions if you click the discover button a couple times it may find the device and finish pairing but it very unlikely. How many of these ghost nodes do you have now with all the pairing attempts? Here is a guide with a lost more info: How To Remove Ghosts using hub tools or a UZB Stick
Here is a very old post where someone did get a VRP03 to pair, but based on the age it would have been a C5 hub is my guess, maybe even a C3. A lot of people have had issues with the old Leviton Vizia devices on the C8 (due to the 800 series radio we assume). Woes Pairing Leviton ZWave Dimmers
