Bevo, unfortunately your description of the behaviour of ESCs is not entirely correct.

The ESC does not in any way limit the amount of current. If the motor/prop/battery combo will draw 20 Amps, and the ESC is only rated for 10 Amps, 20 Amps will still flow through the ESC. At least, until the ESC goes up in a puff of smoke

Some ESCs do have overcurrent protection built in, but those will shut the motor off as a general rule. I'm personally not familiar with one that backs off on the throttle when it's overloaded.

I'm not sure of the conditions of your test was performed under. Were you drawing more than 5 Amps?