Overcurrent fault

I am using a flipsky dualfsesc 6.6, 12s 12c lipo (2 6s in series), on an electric mountainboard. I've been having a few symptoms that I believe may be due to an overcurrent fault, I'll start with the symptoms while riding, when motors are under load there seems to be a great deal less torque than there should be with 70 phase/motor amps per side, this issue is only while accelerating rather than braking, still recieving full brake torque. When pressing the throttle unloaded (drivetrain detached, motors spinning freely) the motors will stutter and present an overcurrent fault that seems to only happen on one side. The following link is a video demonstrating this

 if anybody is having similar symptoms or has solved the same issue before any help would be appreciated.