Cascading WRT1900AC into an upstream router but cannot disable WRT1900AC's NAT

My WRT1900AC firmware version is 1.1.8.164461
I've been trying to get my WRT1900AC to cascade into an upstream router without double NAT, but even when I select "Dynamic Routing (RIP)" the WRT1900AC is still doing NAT. Is there a way to DISABLE NAT on the WRT1900AC?
My configuration is:
Computers->WRT1900AC->SecureRouter->CableModem
The SecureRouter is a wired-only security appliance that provides an additional layer of protection. I have it configured with a DHCP server (192.168.55.1/24), and two static routes that should permit the WRT1900AC regular traffic (192.168.1.1/24) and guest traffic (192.168.33.1/24) that redirect traffic to 192.168.55.10, which is the IP address the WRT1900AC gets assigned by SecureRouter (using DHCP Reservation and the WRT1900AC MAC address).
But, then I look at the logs in SecureRouter, and all the traffic is originating at 192.168.55.10. I don't want that because one of the features of SecureRouter is to detect DDOS if a client makes too many calls to a DNS server within a certain time range. Even though I've upped this limit, SecureRouter should really be getting the client IP addresses as they were originally assigned by the WRT1900AC to avoid this and allow me to track down a rogue system.
Researching the problem here in the forum directed me to:
http://www.practicallynetworked.com/networking/fixing_double_nat.htm
and the solution they propose is to put the second router (ie, WRT1900AC) into the DMZ of the first (SecureRouter). But, I don't think I really want my entire network to be in the DMZ. I'm sure I lose some protection, but I'm not sure what. Maybe I'm overreacting.
Both the WRT1900AC and SecureRouter give me great statistics and pictures of what's going on in the network. I would prefer not to "bridge" (is that possible?) if it meant losing the picture/logs/graphs/tables either of these devices produce.
Can someone out there figure out how I can have my cake and eat it too? Would this work with an E3000 instead of a WRT1900AC? (assuming the E3000 really can disable NAT).

Ok I confirmed that the disable NAT feature does work in the WRT1900AC firmware 1.1.8.164461.
When NAT is disabled in the WRT1900AC and all Firewall settings are disabled you can access the network connected to the WRT1900AC WAN\Internet Port and the Internet while connect to the WRT1900AC's LAN\Wireless network. The WRT1900AC's LAN\Wireless devices are not accessible from the WAN network because the WAN doesn't know the route to the WRT1900AC's LAN network.
You have to add a Static Route to your main router so it can route packets to the WRT1900AC which then route's them to the LAN.
Example Static Router needed for main router:
The Default Gateway in the above Static Route is the WAN IP Address of the WRT1900AC.
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

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