c7000 and xbox live/PSN

So my family pays for comcasty xfinity blast so our download speed is like 80 mbps down and 12 mbps up, on the xbox one it says nat is open, then if I load black ops 3 for instance the nat changes in the game says strict when connected via eithernet cord (says open or moderate if wireless) and that the game tried to use UDP port 3075 to the required port for an open nat in game.

I've tried enabling port forwarding and UPnP is enabled alreadty and neither fixed it, the last thing the game menu says is add your xbox to DMZ to get the nat to appear open in game which I am not positive what that means.

is there any other setting to change to help get good connectivity on xbox live or PSN settings wise?

No one in my family is super tech savey with this type of thing so I'm trying to find a solution here