There is no double nat. Passthrough mode has worked as expected for me. The one issue I have is that the RG will maintain firewall states, so it limits you to the RG hardware for those states. I have a pretty large home network though, tons of devices, IoT, etc, and it has been stable.
Latency seems decent. I have an AT&T fiber 2gb symmetrical connection and a ping to google from my Netgate pfSense machine is around 10-15ms.
Respectfully, punching down does nothing but make people who are suffering feel worse. Posting here about how much better you have it than us isn’t helpful. We already know how messed up it is here.