According to this chart, that controller should be able to do 60 amps continuous for your phase current but these controllers aren’t very robust. I think the issue is that you’re pulling a ton of current through a single controller to get your desired speed and torque etc… @b264 has given you a good suggestion re reducing the battery max. If that addresses your issue then great. Personally, I’d grab another controller and motor and ugrade your ride. For your needs I’d think 2 motors is required. Or maybe you’ve outgrown your board and it’s time to DIY a high-performance murder board 