The controller limits the flow of amps. you need a more powerful controller.
do you know what motor it is? Or who manufactured it?
Your best bet is to go onto the forum 'Endless Sphere' and photograph the bike, the motor, the controller and if possible the cells inside the battery and see if you can get help. There are many booffindps on there that will probably recognise your parts and be able to direct you.No idea what motor is in it but I know the entire motorcycle was imported from China to a company here in Colombia that is no longer in business. I know that the service tech that put the new battery in had to re-program the controller for the new battery and that the controller has a USB port on it that I guess if you have the right software on you computer you can make changes to it?
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