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If you want more out of a brushless motor, give it more volts *and* modify the drive train gear ratio so it spins faster compared to the output. That way the amps will stay within limits, and everything will be fine, untill you reach the cooling limits..
theres 4 limits to a brushless motor:
-rpm, too much, and bits will fly off. this is typically much much higher than most brushes motors, because no brushes to worry about. bigger diameter motor means lower speeds though.
-magnets, too many amps, and you'll kill the magnetic force. but generally, try to stay far away from that region, as the motor efficiency drops off a lot even before then.
-heat, too hot, and you'll kill the magnets and/or fry the windings, or both. Cooling is required if you push more power through the engine, even if its very efficient.
-volts in absolute sense: the wire isolation might not stand up if you go really far with overvolting, it might arc through. But for a couple volts extra, that shouldn't be a problem.
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