Open mesh is designed mainly for offices and hotels with more than one inbound line.
With all that you are trying to do at once....adding more "routers" is not really going to help your connection.
What you are doing is splitting your signal from your modem, good for signal strength, but your routers are connected to "one" modem.
So you are still going to bottle neck at your modem, and that's probably why your router is "starting to stutter" (either that or you have an old modem?).
I have a 3 smart TV's, 3 smart phones, a Wii, 2 Play stations and 4 laptops drawing signal from my cisco "U"..... of course not all at once, but the televisions and phones and laptops are on after about 3pm.
My current cable modem is 3 years old...... its time for a new one...with a hardware update I will get a better performance from my one year old cisco router.
Do you have the fastest speed your cable or dish company will allow? More often than not you are locked into what is available and not really the "boosted" speed.
To get the faster speeds, they will open your band width, they call it "boosting" to make it sound great... but it just allows for more packets of info to process and of course it costs more.
Maybe you could ask them for a "business" line..... of course you will pay out the who haw for it, but it would provide really fast speeds.
Not sure how hip you are on the net thing...sounds like you know what you want..... i'm just not sure you are going to get more speed or stop the stutter, with that setup.
You don't have to buy the cameras....they make Wi-Fi extenders, but they loose about 50% of speed from the relay.
There is a system however you can plug into your wall outlets...
http://thewirecutter.com/reviews/best-powerline-networking-kit/Anyway, let us know how your setup works, its always good to get information from folks that actually find a system that works well.