Airports are creating too many separate networks, how to fix?

Here's a picture of my current setup. I have 1 Airport extreme that creates a 2ghz and 5ghz network. It travels via ethernet to a airtport express 2G that creates 2ghz and 5ghz networks of the same name as the Airport etreme.

Within that whole setup I have 2 Airport express' extending the 2ghz network which I believe is creating my problem.....

With this whole setup some sections of my home get these results:

It's quite annoying especially when streaming airplay because my iphone or such device will jump back and forth between the two networks making the music stream choppy.

How would I make both the networks merge as one? Is there a way to extend a network using ethernet as the connection instead of wifi??