Should be as simple as open up the controller fine the 2 phase wires that go thru the hall sensors to read the current big square things, prob blue. Cut the wires before the sensors, grab 2x 8awg wires and solder them to the original single 8awg wire, feed one thru the sensor and then use the other to bypass the sensor. This will lower the current it reads tricking the controller into supplying more power. You will only be able to get up to about 16kw per controller with this as it also has another way to sense the power draw and will cut out if it goes too high.
Try looking up the original controller thread for sabvotons as i did a quick write up of the process inc pics.
Derek