Extending WiFi airport network through ethernet

Dear mac users,
in a three stories house I used to have a wifi network, containing the internet provider modem-router as DHCP, an airport extreme via ethernet to it (bridge mode), and a time capsule and an airport express extending wirelessly the network in the 2 other floors respectively. As I had delays in wireless backup and some hickups in music streaming from the airport express and video streeaming from apple tv, I decided to change the topology and connect the time capsule and airport express via ethernet to my airport extreme. I took the opportunity and used a netgear switch to hardwire 3 other ethernet sockets in my house. In one of those I plugged the apple tv. I followed your guidelines and use the create a network and bridge mode guideline for setting up the devices. I also use the same name and password for my network, (name: abc, and a WPA2 password). Internet access is OK in all stories. Nevertheless I have two irrtating issues:
a) the airport utility cannot see all three airport devices simultaneously (airport extreme, airport express, time capsule), as before. It only sees the ones in range, depending on the position of my mac in the house.
b) it seems that depending on my position in the house the network my computers are joining has different name, ie. abc 2, or abc 3 or abc. In addition the remote app on my iphone and ipad, cannot see the aiport express to stream music when they are not in range to the airport express.
Could you please help me. What's wrong with my setup?
Thank you in advance for you kind support
George

+Do I need to turn of NAT for the roaming network to work?+
If your AirPort Extreme is connected to a modem (only one ethernet port on the device), then you need to configure the AirPort Extreme to handle both DHCP and NAT. This will be done for you automatically when you do the following:
Open AirPort Utility - Manual Setup
Click the Internet icon
Connection Sharing = Share a public IP address
If your AirPort Extreme is connected to a gateway (a combination modem and router that will have 3-4 ethernet ports), then you need to setup the AirPort Extreme as a "bridge"
Open AirPort Utility - Click Manual Setup
Click the Internet icon
Connection Sharing = Off (Bridge Mode)
All of your other devices...Time Capsule, AirPort Express must be configured as follows:
Open AirPort Utility - Click Manual Setup
Click the Wireless tab below the row of icons
Wireless Mode = Create a wireless network
Wireless Network Name = Exact same name as your AirPort Extreme network
Radio Mode = Your choice, but should be similar to the AirPort Extreme
Channel = Automatic*
Wireless Security = Exact same setting as your AirPort Extreme
Wireless Password = Same password as AirPort Extreme
Click the Internet icon
Connect Using = Ethernet
Connection Sharing = Off (Bridge Mode)
Update to save settings
* With a lot of devices, you may want to set the Channel manually. Set up separate channels for each device and keep the channels as far apart as possible.

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