One thing to consider, when it's only 70 degrees outside, the air conditioner compressor may not even be running; it may just be circulating ambient air. Assuming of course you've got it set so that the fan blows air all the time.
Try this… Crank the thermostat as high as it will go, so that you know that the AC is only blowing ambient air. Then lower the thermostat a couple of degrees at a time until the compressor kicks on to start cycling freon. If the breaker trips then, you've isolated the problem. And if that doesn't cause the breaker to trip, you've eliminated a possible cause.
Engineering: Finding complex solutions to simple problems you didn't even know you had.