Google Wifi Xbox One Nat

Hi folks i have 3 google wifi nodes that connect directly to my modem there is no other router on my network and i have a standalone modem.
Google wifi xbox one nat. To get open nat when you have more than one xbox on your router you need to use a second port. In bridge mode this single mesh point will operate as a pure wi fi access point connected over an ethernet wire to the primary modem router. Bridge mode disables the dhcp and routing functions so double nat is no longer an issue. This is where the problem lies.
Xbox has allowed the use of port 3074 udp and tcp only. To attain open nat on one xbox you simply forward port 3074 udp and tcp. The issue i m having is that as the isp provided router is not a stand alone modem i am running into a double nat issue on my xbox one and latency is going from 6ms to sometimes even 400ms whilst playing. Bridge mode disables the dhcp and routing functions so double nat is no longer an issue.
A single google wifi point or google nest wifi router that is not part of a mesh system can be set to bridge mode. Nat for multiple xboxes is always going to be a pain in the ass until ipv6 becomes widespread. When i go into my xbox one settings i see that a double nat is detected by the xbox. It s a house full of large men haha.
Upnp is on and yes there are 3 xbox one s on the network.