Airport Express extending wireless network issue in bridge mode

Hi,
I have an Airport Extreme (AX) connected to a Cable modem, and it is acting as a router and a DHCP server. To extend the wireless range I'm using an Airport express (AE) connected to the Airport Extreme using a wired gigabit ethernet connection.
I'm trying to set the AE in bridge mode as I don't want to setup another network segment and wireless network, I just want to use the AX as the DHCP server. Unfortunately, this doesn't seem to work. In this mode, the clients connected to the AE wirelessly can't get an IP address, and even when using a fixed IP address, it can't ping the AX router.
The only way I can set it to work is to set the AE to share a public address and create a new wireless network with a different name.
Original wireless network IP address: 192.168.0.x
Second wireless network IP address: 10.0.0.x
This gives a double NAT warning which I have to disable.
I've tried rolling back the firmware of the AE to 7.4.2 and that didn't seem to help.
Details:
Airport Extreme (Simultaneous Dual-Band II) - running 7.5.2
Airport Express (Wireless N) - 7.5.2 and 7.4.2

but I can't find an option to configure the AE as a "roaming network"
There isn't one. It's a term used to describe a particular type of setup.
Check your ethernet cable for proper operation by connecting a laptop. Turn off wireless on the laptop and make sure that you can get a good Internet connection. If you can, this confirms that the ethernet cable is working correctly. If you can not, you need to trobleshoot the ethernet connection first before you go any further.
On your AirPort Express, check your settings using AirPort Utility - Manual Setup
Click the Wireless tab below the icons
Wireless Mode = Create a wireless network
Wireless Network Name = Same name as your main router
No check mark needed next to Allow this network to be extended
Radio Mode = 802.11n (802.11b/g compatible) a good choice. Your call here
Channel = Automatic (No need to manually set the channels on either router, but you can if you want)
Wireless Security = Same setting as your main network
Wireless Password = Same password as your main network
Confirm Password
Click the Internet icon
Connect Using = Ethernet
Connection Sharing = Off (Bridge Mode)
Update to save settings and the Express will restart in 40-45 seconds. You should have a green light. Important....now you need to restart your entire network.
Power everything down, order is not important. Start the modem first, let it run a few moments by itself. Then start your main router the same way. Then start all other devices the same way.

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