I think i *MIGHT* have figured out a way to double the speed . wire the lamp as a 240 volt load. connect the cordset as a 240 volt supply to the meter (but don't actually connect it to 240 volts at the wall) don't connect anything to the neutral terminal of the meter. now the meter should measure the current TWICE. if you put a 100 watt bulb is there, it will measure 100 watts on the hot and 100 watts on the meter's other hot (which is actually the neutral in your setup), so it will spin twice as fast.
It might not work because the voltage is not at opposite "phases" as it would be with a 240 volt system. yes, i know they are not phases but i can't think of any other way to explain it.
