The overcurrent lockout is a built in safety feature of a lot of motor driver chips; if the current spikes above the maximum, the chip will shut off all outputs until the chip is returned to brake mode (center stick). It's a really unhelpful feature when used in fighting robots; I had similar problems when designing my ant weight and feather weight ESCs. There's no way to remove it as far as i know unfortunately, other than to slowly ramp the stick from forward to reverse like I have to when driving my featherweight. There must be some solution though; my featherweight uses the same driver chips as the Scorpion XL ESC, which runs drill motors fine as far as I know...

The 20A one just uses 4 MOSFETs, which means it'll have none of the fancy safety features built in. They may have added extra circuitry to include it, but that should be easy enough to remove if necessary. I might get these for a beetle then, if the 10A ones are a little suspect...