See, this is what is wrong with the mightyboard versus any of the ones the RepRap machines use because you are so detached that no one easily knows what the Vrefs should be unlike in something like Marlin that is extremely well documented. I can tell you 118 is horribly wrong as a Vref if the motor will almost blister you when you touch it after 2 hours of printing.

To calculate the current on a Stepstick, A = VREF / (8 * RS). For a standard stepstick, RS is the rating of the Sense Resistor = 0.2ohm. So A = VREF / 1.6 and I normally run mine around 300-550ma (Z has two motors on it so requires more current) but with the Mightyboard wth does a Vref of 118 mean?

Digging around the Google-sphere I found the RS is probably 10k ohm so 118/(8*10000)=118/80000=gibberish as the value is far too low and the motors are far too hot for that answer to be correct.