Incorrect Hostnames

[yubiuser]

It's part of the new/mac_clients branch, see here. Please not this branch is still under development and can break things and should be considered as "testing".

Another approach might be to disable IPv6 resolution on pihole.

Network table - seeing clients as hostname of router rather than devices

Well, this sort of exists. Try RESOLVE_IPV6=no into /etc/pihole/pihole-FTL.conf (create if it does not exist) and restarting with pihole restartdns. Pi-hole will now stop to resolve IPv6 addresses. It may take some minutes (up to an hour) until you see the update on the network table.