That was my experience as well. I have three seperate VLANs (Untrusted Devices, Servers, Normal) which is easy with IPv4/NAT/HAProxy. IPv6 was unpredictable i

That was my experience as well. I have three seperate VLANs (Untrusted Devices, Servers, Normal) which is easy with IPv4/NAT/HAProxy. IPv6 was unpredictable in how I could get more than a /64 subnet (so no VLANs allowed). After guessing at how to get it for a few hours, I was able to get a /56 subnet, and set it up. I even disabled IPv4 (dual stack caused it's own set of issues). IPv6 was much, much slower. I was unable to track down why it was so much slower, so I ended up just doing back to IPv4.