RE: 2 brushless motor wiring?
Hurkey, i'm going to try to help you. Your post is a little confusing, but I think I know what you're asking.
First off, I want to clear one thing up. The ESC doesn't determine the current draw from the battery, the motor/prop combo does. You choose a speed controller with an amperage rating that will support your motor/prop current requirements.
Here's an example: Let's say you have a motor/prop combo that draws 15 Amps max static at full throttle. You can run an ESC that has a rating of 100 Amps if you really want to, but that motor/prop combo is still only going to draw 15 Amps. The load determines current draw, not the controller. Now, let's look at it the other way around. You have a motor/prop combo that will draw 50 Amps at full throttle. If you run a 30 Amp ESC, the ESC will most likely burn up because it can't handle 50 Amps, understand? The Speed controller only supplies current to the motor, but doesn't determine the amount drawn. Changing props will affect current draw, changing to a higher or lower Kv rated motor will affect current draw. As a general rule of thumb, the higher the Kv rating, the smaller or lower pitch prop you will need, and the lower the Kv rating, the larger or higher pitch prop you can run. The same with increasing or decreasing the number of cells in your batteries. The Kv rating means rpm per volt, so for every volt you feed the motor, it's going to try to turn that many rpm's. The more voltage, the higher the rpm's. The lower the voltage, the lower the rpm's.
Next, let's look at your question about the batteries. First, running batteries in Series compounds the Voltage, so if you ran two 3S packs in series, you would actually be running 22.2 Volts, not 11.1. If you want to stay with 11.1 Volts, you will need to run the packs Parallel. Running them Parallel will increase capacity, but not Voltage.
What you need to do if you want to run 11.1 V is to run the ESC battery leads in Parallel to 1 battery. If you run a 3S 5000Ma pack with a 30C discharge rating, that pack can deliver 150 Amps, should be more than enough.
You really should get a Wattmeter also, will help you tremendously in setting up your system properly.
Hope this helps some.