Sorry if I am being obtuse, and sorry again if I am hijacking someone's else thread... but I just do not get the issue with the /64 network and the need for NAT6, perhaps I am not as well informed about IPv6 as I though.
If the ISP issued a /64 (as many ISP's do) to the OP, isn't OP supposed to just use that address, so all devices in his LAN get an address within that /64 subnet? Why the need for NAT6, then?
Also, should't OP's LAN interface have an address in the 2804:.../64 range (it doesn't)? Shouldn't all his devices connected to LAN have an address in the 2804:.../64 range (not tested)? Or I am missing something here?